Module keys from libxslt

# The XSLT C library for GNOME ## Module keys from libxslt

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implementation of the key mechanims. ## Table of Contents
    #define NODE_IS_KEYED
    int	xsltAddKey			(xsltStylesheetPtr style,
    					 const xmlChar * name,
    					 const xmlChar * nameURI,
    					 const xmlChar * match,
    					 const xmlChar * use,
    					 xmlNodePtr inst)
    void	xsltFreeDocumentKeys		(xsltDocumentPtr idoc)
    void	xsltFreeKeys			(xsltStylesheetPtr style)
    xmlNodeSetPtr	xsltGetKey		(xsltTransformContextPtr ctxt,
    					 const xmlChar * name,
    					 const xmlChar * nameURI,
    					 const xmlChar * value)
    void	xsltInitCtxtKeys		(xsltTransformContextPtr ctxt,
    					 xsltDocumentPtr idoc)
## Description ### Macro: NODE_IS_KEYED
    #define NODE_IS_KEYED
check for bit 15 set ### Function: xsltAddKey
    int	xsltAddKey			(xsltStylesheetPtr style,
    					 const xmlChar * name,
    					 const xmlChar * nameURI,
    					 const xmlChar * match,
    					 const xmlChar * use,
    					 xmlNodePtr inst)
add a key definition to a stylesheet
`style`: | an XSLT stylesheet
`name`: | the key name or NULL
`nameURI`: | the name URI or NULL
`match`: | the match value
`use`: | the use value
`inst`: | the key instruction
`Returns`: | 0 in case of success, and -1 in case of failure.
### Function: xsltFreeDocumentKeys
    void	xsltFreeDocumentKeys		(xsltDocumentPtr idoc)
Free the keys associated to a document
`idoc`: | a XSLT document
### Function: xsltFreeKeys
    void	xsltFreeKeys			(xsltStylesheetPtr style)
Free up the memory used by XSLT keys in a stylesheet
`style`: | an XSLT stylesheet
### Function: xsltGetKey
    xmlNodeSetPtr	xsltGetKey		(xsltTransformContextPtr ctxt,
    					 const xmlChar * name,
    					 const xmlChar * nameURI,
    					 const xmlChar * value)
Looks up a key of the in current source doc (the document info on @ctxt->document). Computes the key if not already done for the current source doc.
`ctxt`: | an XSLT transformation context
`name`: | the key name or NULL
`nameURI`: | the name URI or NULL
`value`: | the key value to look for
`Returns`: | the nodeset resulting from the query or NULL
### Function: xsltInitCtxtKeys
    void	xsltInitCtxtKeys		(xsltTransformContextPtr ctxt,
    					 xsltDocumentPtr idoc)
Computes all the keys tables for the current input document. Should be done before global varibales are initialized. NOTE: Not used anymore in the refactored code.
`ctxt`: | an XSLT transformation context
`idoc`: | a document info
Daniel Veillard