req=context.createSubRequest("active:validateRNG");
req.addArgument("operand", [resource representation, aspect, or URI] );
req.addArgument("operator", [resource representation, aspect, or URI] );
result=context.issueSubRequest(req);
Purpose
The validateRNG accessor is used to validate the operand against a RelaxNG schema operator document.
RelaxNG is an OASIS standard schema language. Unlike XML schema it is easy to learn
and can be easily read.
A document can be validated several times in a processing pipeline and against different or even dynamically
generated schema. Validation can be the basis for pipeline branches.
validateRNG returns a canonical boolean document <b>t</b> true, or
<b>f</b> false. If
an error occurs in validation an error element is appended to the boolean response. By default the RNG validator will attempt
to return an XPath reference to the source of the error - see param syntax below for override.
Parameter Syntax
validateRNG takes an optional parameter document with arguments for the validation engine.
processErrorsOff Disble error processing for generating XPath locations to
the error. Xpath Error Processing is enabled by default and can be turned off for a small
increase in performance. However if the document is valid there is no adavantage to turning off
error processing.
feasible Feasible validation.
validateRNG is implemented using James Clarke's Jing validator. This supports an optional mode
to Feasibly validate a document, here's the Jing description:
"Checks that the document is feasibly valid. A document is feasibly valid if it could be transformed
into a valid document by inserting any number of attributes and child elements anywhere in the tree.
This is equivalent to transforming the schema by wrapping every data, list, element and attribute element
in an optional element and then validating against the transformed schema. This option may be useful while
a document is still under construction. This option also disables checking that for every IDREF there
is a corresponding ID."
Preface
Accessor Listing
ASpell Spell Checker
