extra: interface for the non-standard features

## extra

extra - interface for the non-standard features

implement some extension outside the XSLT namespace but not EXSLT with is in a different library.

Author(s): Daniel Veillard

## Synopsis

    #define XSLT_LIBXSLT_NAMESPACE;
    #define XSLT_SAXON_NAMESPACE;
    #define XSLT_XALAN_NAMESPACE;
    #define XSLT_XT_NAMESPACE;
    void	xsltDebug			(xsltTransformContextPtr ctxt,
    					 xmlNodePtr node,
    					 xmlNodePtr inst,
    					 xsltElemPreCompPtr comp);
    void	xsltFunctionNodeSet		(xmlXPathParserContextPtr ctxt,
    					 int nargs);
    void	xsltRegisterAllExtras		(void);
    void	xsltRegisterExtras		(xsltTransformContextPtr ctxt);

## Description

## Details

### Macro XSLT_LIBXSLT_NAMESPACE

    #define XSLT_LIBXSLT_NAMESPACE;

This is the libxslt namespace for specific extensions.

### Macro XSLT_SAXON_NAMESPACE

    #define XSLT_SAXON_NAMESPACE;

This is Michael Kay's Saxon processor namespace for extensions.

### Macro XSLT_XALAN_NAMESPACE

    #define XSLT_XALAN_NAMESPACE;

This is the Apache project XALAN processor namespace for extensions.

### Macro XSLT_XT_NAMESPACE

    #define XSLT_XT_NAMESPACE;

This is James Clark's XT processor namespace for extensions.

### xsltDebug ()

    void	xsltDebug			(xsltTransformContextPtr ctxt,
    					 xmlNodePtr node,
    					 xmlNodePtr inst,
    					 xsltElemPreCompPtr comp)

Process an debug node

`ctxt`: | an XSLT processing context
`node`: | The current node
`inst`: | the instruction in the stylesheet
`comp`: | precomputed information

### xsltFunctionNodeSet ()

    void	xsltFunctionNodeSet		(xmlXPathParserContextPtr ctxt,
    					 int nargs)

Implement the node-set() XSLT function node-set node-set(result-tree) This function is available in libxslt, saxon or xt namespace.

`ctxt`: | the XPath Parser context
`nargs`: | the number of arguments

### xsltRegisterAllExtras ()

    void	xsltRegisterAllExtras		(void)

Registers the built-in extensions

### xsltRegisterExtras ()

    void	xsltRegisterExtras		(xsltTransformContextPtr ctxt)

Registers the built-in extensions. This function is deprecated, use xsltRegisterAllExtras instead.

`ctxt`: | a XSLT process context