req=context.createSubRequest("active:luceneSearch");
req.addArgument("operator", [resource representation, aspect, or URI] );
result=context.issueSubRequest(req);
Purpose
Lucene is a full text indexing and searching technology from Apache.
Lucene provides low-level text indexing and searching facilities. This accessor adds
a layer over Lucene to support indexing over the content XML documents preserving
the xpath locations of the content. This approach allows content to be located down
to the element level across multiple documents.
The luceneSearch accessor supports searching over a single lucene
index.
The <unique/> tag in the operator document causes the search results
to be filter for on the best match per indexed docId.
Query Syntax
By default the search looks for complete words in the text content of
the document. Multiple words can be specified and these are 'OR'ed together
(matches will all of them score highest). 'AND' can be used to only find
all keywords.
Examples:
cow only find documents with the word cow mentioned
blue cow only find documents with the words cow or blue mentioned
blue AND cow only find documents with the words cow and blue mentioned
cow AND basis:/animal/name only find documents with the word cow in elements
with the path /animal/name
blue AND basis:colour only find documents with the word blue in any elements
with the name colour
docid:addressbook.xml only find matches in the document indexed under the
id of addressbook.xml
This may not be the whole story- digging deeper into the lucene
document may reveal more.
<basis> contains an a basis xpath expression that describes
the effective element type. Multiple elements may have the same basis. <xpath> contains an a xpath expression locates a unique single
element with the document. <uri> contains the uri of the originally indexed document <docid> contains the id that the document was indexed under <score> contains a scoring for the match normalized between one
and zero. One being a perfect match. A match is lower if it is found within a larger
body of text. A match is lower if not all of multiple keywords matched.
Search results remain valid whilst no indexing operations are performed. Updating
index causes previous search results to expire.
Preface
Accessor Listing
ASpell Spell Checker
