XMPInfo.php

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<?php
class XMPInfo {

        public static function getItems ( ) {
                if( !self::$ranHooks ) {
                        // This is for if someone makes a custom metadata extension.
                        // For example, a medical wiki might want to decode DICOM xmp properties.
                        wfRunHooks('XMPGetInfo', Array(&self::$items));
                        self::$ranHooks = true; // Only want to do this once.
                }
                return self::$items;
        }

        static private $ranHooks = false;

        static private $items = array(
                'http://ns.adobe.com/exif/1.0/' => array(
                        'ApertureValue' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'BrightnessValue' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'CompressedBitsPerPixel' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'DigitalZoomRatio' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'ExposureBiasValue' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'ExposureIndex' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'ExposureTime' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'FlashEnergy' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational',
                        ),
                        'FNumber' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'FocalLength' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'FocalPlaneXResolution' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'FocalPlaneYResolution' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'GPSAltitude' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational',
                        ),
                        'GPSDestBearing' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'GPSDestDistance' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'GPSDOP' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'GPSImgDirection' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'GPSSpeed' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'GPSTrack' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'MaxApertureValue'  => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'ShutterSpeedValue' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        'SubjectDistance'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational'
                        ),
                        /* Flash */
                        'Flash'             => array(
                                'mode'      => XMPReader::MODE_STRUCT,
                                'children'  => array(
                                        'Fired'      => true,
                                        'Function'   => true,
                                        'Mode'       => true,
                                        'RedEyeMode' => true,
                                        'Return'     => true,
                                ),
                                'validate'  => 'validateFlash',
                                'map_group' => 'exif',
                        ),
                        'Fired'             => array(
                                'map_group' => 'exif',
                                'validate'  => 'validateBoolean',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'Function'          => array(
                                'map_group' => 'exif',
                                'validate'  => 'validateBoolean',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'Mode'              => array(
                                'map_group' => 'exif',
                                'validate'  => 'validateClosed',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'choices'   => array( '0' => true, '1' => true,
                                                '2' => true, '3' => true ),
                                'structPart'=> true,
                        ),
                        'Return'            => array(
                                'map_group' => 'exif',
                                'validate'  => 'validateClosed',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'choices'   => array( '0' => true,
                                                '2' => true, '3' => true ),
                                'structPart'=> true,
                        ),
                        'RedEyeMode'        => array(
                                'map_group' => 'exif',
                                'validate'  => 'validateBoolean',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        /* End Flash */
                        'ISOSpeedRatings'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SEQ,
                                'validate'  => 'validateInteger'
                        ),
                        /* end rational things */
                        'ColorSpace'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '1' => true, '65535' => true ),
                        ),
                        'ComponentsConfiguration'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SEQ,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '1' => true, '2' => true, '3' => true, '4' => true,
                                                '5' => true, '6' => true )
                        ),
                        'Contrast'          => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '0' => true, '1' => true, '2' => true )
                        ),
                        'CustomRendered'    => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '0' => true, '1' => true )
                        ),
                        'DateTimeOriginal'  => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateDate',
                        ),
                        'DateTimeDigitized' => array(  /* xmp:CreateDate */
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateDate',
                        ),
                        /* todo: there might be interesting information in
                         * exif:DeviceSettingDescription, but need to find an
                         * example
                         */
                        'ExifVersion'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'ExposureMode'      => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'rangeLow'  => 0,
                                'rangeHigh' => 2,
                        ),
                        'ExposureProgram'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'rangeLow'  => 0,
                                'rangeHigh' => 8,
                        ),
                        'FileSource'        => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '3' => true )
                        ),
                        'FlashpixVersion'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'FocalLengthIn35mmFilm' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateInteger',
                        ),
                        'FocalPlaneResolutionUnit' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '2' => true, '3' => true ),
                        ),
                        'GainControl'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'rangeLow'  => 0,
                                'rangeHigh' => 4,
                        ),
                        /* this value is post-processed out later */
                        'GPSAltitudeRef'    => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '0' => true, '1' => true ),
                        ),
                        'GPSAreaInformation' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'GPSDestBearingRef' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( 'T' => true, 'M' => true ),
                        ),
                        'GPSDestDistanceRef' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( 'K' => true, 'M' => true,
                                                'N' => true ),
                        ),
                        'GPSDestLatitude'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateGPS',
                        ),
                        'GPSDestLongitude'  => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateGPS',
                        ),
                        'GPSDifferential'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '0' => true, '1' => true ),
                        ),
                        'GPSImgDirectionRef' => array(
                                'map_group'  => 'exif',
                                'mode'       => XMPReader::MODE_SIMPLE,
                                'validate'   => 'validateClosed',
                                'choices'    => array( 'T' => true, 'M' => true ),
                        ),
                        'GPSLatitude'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateGPS',
                        ),
                        'GPSLongitude'      => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateGPS',
                        ),
                        'GPSMapDatum'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'GPSMeasureMode'    => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '2' => true, '3' => true )
                        ),
                        'GPSProcessingMethod' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'GPSSatellites'     => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'GPSSpeedRef'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( 'K' => true, 'M' => true,
                                                'N' => true ),
                        ),
                        'GPSStatus'         => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( 'A' => true, 'V' => true )
                        ),
                        'GPSTimeStamp'      => array(
                                'map_group' => 'exif',
                                // Note: in exif, GPSDateStamp does not include
                                // the time, where here it does.
                                'map_name'  => 'GPSDateStamp',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateDate',
                        ),
                        'GPSTrackRef'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( 'T' => true, 'M' => true )
                        ),
                        'GPSVersionID'      => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'ImageUniqueID'     => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'LightSource'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                /* can't use a range, as it skips... */
                                'choices'   =>  array( '0' => true, '1' => true,
                                        '2' => true, '3' => true, '4' => true,
                                        '9' => true, '10' => true, '11' => true,
                                        '12' => true, '13' => true,
                                        '14' => true, '15' => true,
                                        '17' => true, '18' => true,
                                        '19' => true, '20' => true,
                                        '21' => true, '22' => true,
                                        '23' => true, '24' => true,
                                        '255' => true,
                                ),
                        ),
                        'MeteringMode'      => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'rangeLow'  => 0,
                                'rangeHigh' => 6,
                                'choices'   => array( '255' => true ),
                        ),
                        /* Pixel(X|Y)Dimension are rather useless, but for
                         * completeness since we do it with exif.
                         */
                        'PixelXDimension'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateInteger',
                        ),
                        'PixelYDimension'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateInteger',
                        ),
                        'Saturation'        => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'rangeLow'  => 0,
                                'rangeHigh' => 2,
                        ),
                        'SceneCaptureType'  => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'rangeLow'  => 0,
                                'rangeHigh' => 3,
                        ),
                        'SceneType'         => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '1' => true ),
                        ),
                        // Note, 6 is not valid SensingMethod.
                        'SensingMethod'     => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'rangeLow'  => 1,
                                'rangeHigh' => 5,
                                'choices'   => array( '7' => true, 8 => true ),
                        ),
                        'Sharpness'         => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'rangeLow'  => 0,
                                'rangeHigh' => 2,
                        ),
                        'SpectralSensitivity' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        // This tag should perhaps be displayed to user better.
                        'SubjectArea'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SEQ,
                                'validate'  => 'validateInteger',
                        ),
                        'SubjectDistanceRange' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'rangeLow'  => 0,
                                'rangeHigh' => 3,
                        ),
                        'SubjectLocation'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SEQ,
                                'validate'  => 'validateInteger',
                        ),
                        'UserComment'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_LANG,
                        ),
                        'WhiteBalance'      => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '0' => true, '1' => true )
                        ),
                ),
                'http://ns.adobe.com/tiff/1.0/' => array(
                        'Artist'            => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'BitsPerSample'     => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SEQ,
                                'validate'  => 'validateInteger',
                        ),
                        'Compression'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '1' => true, '6' => true ),
                        ),
                        /* this prop should not be used in XMP. dc:rights is the correct prop */
                        'Copyright'         => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_LANG,
                        ),
                        'DateTime'          => array(  /* proper prop is xmp:ModifyDate */
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateDate',
                        ),
                        'ImageDescription'  => array(  /* proper one is dc:description */
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_LANG,
                        ),
                        'ImageLength'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateInteger',
                        ),
                        'ImageWidth'        => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateInteger',
                        ),
                        'Make'              => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'Model'             => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        /**** Do not extract this property
                         * It interferes with auto exif rotation.
                         * 'Orientation'       => array(
                         *      'map_group' => 'exif',
                         *      'mode'      => XMPReader::MODE_SIMPLE,
                         *      'validate'  => 'validateClosed',
                         *      'choices'   => array( '1' => true, '2' => true, '3' => true, '4' => true, 5 => true,
                         *                      '6' => true, '7' => true, '8' => true ),
                         *),
                         ******/
                        'PhotometricInterpretation' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '2' => true, '6' => true ),
                        ),
                        'PlanerConfiguration' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '1' => true, '2' => true ),
                        ),
                        'PrimaryChromaticities' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SEQ,
                                'validate'  => 'validateRational',
                        ),
                        'ReferenceBlackWhite' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SEQ,
                                'validate'  => 'validateRational',
                        ),
                        'ResolutionUnit'    => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '2' => true, '3' => true ),
                        ),
                        'SamplesPerPixel'   => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateInteger',
                        ),
                        'Software'          => array(  /* see xmp:CreatorTool */
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        /* ignore TransferFunction */
                        'WhitePoint'        => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SEQ,
                                'validate'  => 'validateRational',
                        ),
                        'XResolution'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational',
                        ),
                        'YResolution'       => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRational',
                        ),
                        'YCbCrCoefficients' => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SEQ,
                                'validate'  => 'validateRational',
                        ),
                        'YCbCrPositioning'  => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateClosed',
                                'choices'   => array( '1' => true, '2' => true ),
                        ),
                        /********
                         * Disable extracting this property (bug 31944)
                         * Several files have a string instead of a Seq
                         * for this property. XMPReader doesn't handle
                         * mismatched types very gracefully (it marks
                         * the entire file as invalid, instead of just
                         * the relavent prop). Since this prop
                         * doesn't communicate all that useful information
                         * just disable this prop for now, until such
                         * XMPReader is more graceful (bug 32172)
                         * 'YCbCrSubSampling'  => array(
                         *      'map_group' => 'exif',
                         *      'mode'      => XMPReader::MODE_SEQ,
                         *      'validate'  => 'validateClosed',
                         *      'choices'   => array( '1' => true, '2' => true ),
                         * ),
                         */ 
                ),
                'http://ns.adobe.com/exif/1.0/aux/' => array(
                        'Lens'              => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'SerialNumber'      => array(
                                'map_group' => 'exif',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'OwnerName'         => array(
                                'map_group' => 'exif',
                                'map_name'  => 'CameraOwnerName',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                ),
                'http://purl.org/dc/elements/1.1/' => array(
                        'title'             => array(
                                'map_group' => 'general',
                                'map_name'  => 'ObjectName',
                                'mode'      => XMPReader::MODE_LANG
                        ),
                        'description'       => array(
                                'map_group' => 'general',
                                'map_name'  => 'ImageDescription',
                                'mode'      => XMPReader::MODE_LANG
                        ),
                        'contributor'       => array(
                                'map_group' => 'general',
                                'map_name'  => 'dc-contributor',
                                'mode'      => XMPReader::MODE_BAG
                        ),
                        'coverage'          => array(
                                'map_group' => 'general',
                                'map_name'  => 'dc-coverage',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'creator'           => array(
                                'map_group' => 'general',
                                'map_name'  => 'Artist', //map with exif Artist, iptc byline (2:80)
                                'mode'      => XMPReader::MODE_SEQ,
                        ),
                        'date'              => array(
                                'map_group' => 'general',
                                // Note, not mapped with other date properties, as this type of date is
                                // non-specific: "A point or period of time associated with an event in
                                //  the lifecycle of the resource"
                                'map_name'  => 'dc-date',
                                'mode'      => XMPReader::MODE_SEQ,
                                'validate'  => 'validateDate',
                        ),
                        /* Do not extract dc:format, as we've got better ways to determine mimetype */
                        'identifier'        => array(
                                'map_group' => 'deprecated',
                                'map_name'  => 'Identifier',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'language'          => array(
                                'map_group' => 'general',
                                'map_name'  => 'LanguageCode', /* mapped with iptc 2:135 */
                                'mode'      => XMPReader::MODE_BAG,
                                'validate'  => 'validateLangCode',
                        ),
                        'publisher'         => array(
                                'map_group' => 'general',
                                'map_name'  => 'dc-publisher',
                                'mode'      => XMPReader::MODE_BAG,
                        ),
                        // for related images/resources
                        'relation'          => array(
                                'map_group' => 'general',
                                'map_name'  => 'dc-relation',
                                'mode'      => XMPReader::MODE_BAG,
                        ),
                        'rights'            => array(
                                'map_group' => 'general',
                                'map_name'  => 'Copyright',
                                'mode'      => XMPReader::MODE_LANG,
                        ),
                        // Note: source is not mapped with iptc source, since iptc
                        // source describes the source of the image in terms of a person
                        // who provided the image, where this is to describe an image that the
                        // current one is based on.
                        'source'            => array(
                                'map_group' => 'general',
                                'map_name'  => 'dc-source',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'subject'           => array(
                                'map_group' => 'general',
                                'map_name'  => 'Keywords', /* maps to iptc 2:25 */
                                'mode'      => XMPReader::MODE_BAG,
                        ),
                        'type'              => array(
                                'map_group' => 'general',
                                'map_name'  => 'dc-type',
                                'mode'      => XMPReader::MODE_BAG,
                        ),
                ),
                'http://ns.adobe.com/xap/1.0/' => array(
                        'CreateDate' => array(
                                'map_group' => 'general',
                                'map_name' => 'DateTimeDigitized',
                                'mode'     => XMPReader::MODE_SIMPLE,
                                'validate' => 'validateDate',
                        ),
                        'CreatorTool' => array(
                                'map_group' => 'general',
                                'map_name'  => 'Software',
                                'mode'      => XMPReader::MODE_SIMPLE
                        ),
                        'Identifier' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_BAG,
                        ),
                        'Label' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'ModifyDate' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'map_name'  => 'DateTime',
                                'validate'  => 'validateDate',
                        ),
                        'MetadataDate' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                // map_name to be consistent with other date names.
                                'map_name'  => 'DateTimeMetadata',
                                'validate'  => 'validateDate',
                        ),
                        'Nickname' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'Rating' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateRating',
                        ),
                ),
                'http://ns.adobe.com/xap/1.0/rights/' => array(
                        'Certificate' => array(
                                'map_group' => 'general',
                                'map_name'  => 'RightsCertificate',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'Marked' => array(
                                'map_group' => 'general',
                                'map_name'  => 'Copyrighted',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateBoolean',
                        ),
                        'Owner' => array(
                                'map_group' => 'general',
                                'map_name'  => 'CopyrightOwner',
                                'mode'      => XMPReader::MODE_BAG,
                        ),
                        // this seems similar to dc:rights.
                        'UsageTerms' => array(
                                'map_group' => 'general',
                                'mode' => XMPReader::MODE_LANG,
                        ),
                        'WebStatement' => array(
                                'map_group' => 'general',
                                'mode' => XMPReader::MODE_SIMPLE,
                        ),
                ),
                // XMP media management.
                'http://ns.adobe.com/xap/1.0/mm/' => array(
                        // if we extract the exif UniqueImageID, might
                        // as well do this too.
                        'OriginalDocumentID' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        // It might also be useful to do xmpMM:LastURL
                        // and xmpMM:DerivedFrom as you can potentially,
                        // get the url of this document/source for this
                        // document. However whats more likely is you'd
                        // get a file:// url for the path of the doc,
                        // which is somewhat of a privacy issue.
                ),
                'http://creativecommons.org/ns#' => array(
                        'license' => array(
                                'map_name'  => 'LicenseUrl',
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'morePermissions' => array(
                                'map_name'  => 'MorePermissionsUrl',
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'attributionURL' => array(
                                'map_group' => 'general',
                                'map_name'  => 'AttributionUrl',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'attributionName' => array(
                                'map_group' => 'general',
                                'map_name'  => 'PreferredAttributionName',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                ),
                //Note, this property affects how jpeg metadata is extracted.
                'http://ns.adobe.com/xmp/note/' => array(
                        'HasExtendedXMP' => array(
                                'map_group' => 'special',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                ),
                /* Note, in iptc schemas, the legacy properties are denoted
                 * as deprecated, since other properties should used instead,
                 * and properties marked as deprecated in the standard are
                 * are marked as general here as they don't have replacements
                 */
                'http://ns.adobe.com/photoshop/1.0/' => array(
                        'City' => array(
                                'map_group' => 'deprecated',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'map_name'  => 'CityDest',
                        ),
                        'Country' => array(
                                'map_group' => 'deprecated',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'map_name'  => 'CountryDest',
                        ),
                        'State' => array(
                                'map_group' => 'deprecated',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'map_name'  => 'ProvinceOrStateDest',
                        ),
                        'DateCreated' => array(
                                'map_group' => 'deprecated',
                                // marking as deprecated as the xmp prop preferred
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'map_name'  => 'DateTimeOriginal',
                                'validate'  => 'validateDate',
                                // note this prop is an XMP, not IPTC date
                        ),
                        'CaptionWriter' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'map_name'  => 'Writer',
                        ),
                        'Instructions' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'map_name'  => 'SpecialInstructions',
                        ),
                        'TransmissionReference' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'map_name'  => 'OriginalTransmissionRef',
                        ),
                        'AuthorsPosition' => array(
                                /* This corresponds with 2:85
                                 * By-line Title, which needs to be
                                 * handled weirdly to correspond
                                 * with iptc/exif. */
                                'map_group' => 'special',
                                'mode'      => XMPReader::MODE_SIMPLE
                        ),
                        'Credit' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'Source' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'Urgency' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'Category' => array(
                                // Note, this prop is deprecated, but in general
                                // group since it doesn't have a replacement.
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'map_name'  => 'iimCategory',
                        ),
                        'SupplementalCategories' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_BAG,
                                'map_name'  => 'iimSupplementalCategory',
                        ),
                        'Headline' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE
                        ),
                ),
                'http://iptc.org/std/Iptc4xmpCore/1.0/xmlns/' => array(
                        'CountryCode' => array(
                                'map_group' => 'deprecated',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'map_name'  => 'CountryCodeDest',
                        ),
                        'IntellectualGenre' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        // Note, this is a six digit code.
                        // See: http://cv.iptc.org/newscodes/scene/
                        // Since these aren't really all that common,
                        // we just show the number.
                        'Scene' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_BAG,
                                'validate'  => 'validateInteger',
                                'map_name'  => 'SceneCode',
                        ),
                        /* Note: SubjectCode should be an 8 ascii digits.
                         * it is not really an integer (has leading 0's,
                         * cannot have a +/- sign), but validateInteger
                         * will let it through.
                         */
                        'SubjectCode' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_BAG,
                                'map_name'  => 'SubjectNewsCode',
                                'validate'  => 'validateInteger'
                        ),
                        'Location' => array(
                                'map_group' => 'deprecated',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'map_name'  => 'SublocationDest',
                        ),
                        'CreatorContactInfo' => array(
                                /* Note this maps to 2:118 in iim
                                 * (Contact) field. However those field
                                 * types are slightly different - 2:118
                                 * is free form text field, where this
                                 * is more structured.
                                 */
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_STRUCT,
                                'map_name'  => 'Contact',
                                'children'  => array(
                                        'CiAdrExtadr' => true,
                                        'CiAdrCity'   => true,
                                        'CiAdrCtry'   => true,
                                        'CiEmailWork' => true,
                                        'CiTelWork'   => true,
                                        'CiAdrPcode'  => true,
                                        'CiAdrRegion' => true,
                                        'CiUrlWork'   => true,
                                ),
                        ),
                        'CiAdrExtadr' => array( /* address */
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'CiAdrCity' => array( /* city */
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'CiAdrCtry' => array( /* country */
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'CiEmailWork' => array( /* email (possibly separated by ',') */
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'CiTelWork' => array( /* telephone */
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'CiAdrPcode' => array( /* postal code */
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'CiAdrRegion' => array( /* province/state */
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'CiUrlWork' => array( /* url. Multiple may be separated by comma. */
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        /* End contact info struct properties */
                ),
                'http://iptc.org/std/Iptc4xmpExt/2008-02-29/' => array(
                        'Event' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                        ),
                        'OrganisationInImageName' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_BAG,
                                'map_name'  => 'OrganisationInImage'
                        ),
                        'PersonInImage' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_BAG,
                        ),
                        'MaxAvailHeight' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateInteger',
                                'map_name'  => 'OriginalImageHeight',
                        ),
                        'MaxAvailWidth' => array(
                                'map_group' => 'general',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'validate'  => 'validateInteger',
                                'map_name'  => 'OriginalImageWidth',
                        ),
                        // LocationShown and LocationCreated are handled
                        // specially because they are hierarchical, but we
                        // also want to merge with the old non-hierarchical.
                        'LocationShown' => array(
                                'map_group' => 'special',
                                'mode'      => XMPReader::MODE_BAGSTRUCT,
                                'children'  => array(
                                        'WorldRegion' => true,
                                        'CountryCode' => true, /* iso code */
                                        'CountryName' => true,
                                        'ProvinceState' => true,
                                        'City' => true,
                                        'Sublocation' => true,
                                ),
                        ),
                        'LocationCreated' => array(
                                'map_group' => 'special',
                                'mode'      => XMPReader::MODE_BAGSTRUCT,
                                'children'  => array(
                                        'WorldRegion' => true,
                                        'CountryCode' => true, /* iso code */
                                        'CountryName' => true,
                                        'ProvinceState' => true,
                                        'City' => true,
                                        'Sublocation' => true,
                                ),
                        ),
                        'WorldRegion' => array(
                                'map_group' => 'special',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'CountryCode' => array(
                                'map_group' => 'special',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'CountryName' => array(
                                'map_group' => 'special',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                                'map_name'  => 'Country',
                        ),
                        'ProvinceState' => array(
                                'map_group' => 'special',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                                'map_name'  => 'ProvinceOrState',
                        ),
                        'City' => array(
                                'map_group' => 'special',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),
                        'Sublocation' => array(
                                'map_group' => 'special',
                                'mode'      => XMPReader::MODE_SIMPLE,
                                'structPart'=> true,
                        ),

                        /* Other props that might be interesting but
                         * Not currently extracted:
                         * ArtworkOrObject, (info about objects in picture)
                         * DigitalSourceType
                         * RegistryId
                         */
                ),

                /* Plus props we might want to consider:
                 * (Note: some of these have unclear/incomplete definitions
                 * from the iptc4xmp standard).
                 * ImageSupplier (kind of like iptc source field)
                 * ImageSupplierId (id code for image from supplier)
                 * CopyrightOwner
                 * ImageCreator
                 * Licensor
                 * Various model release fields
                 * Property release fields.
                 */
        );
}