XML::XSLT(3p)

NAME
XML::XSLT - A perl module for processing XSLT

xsl_output_method
    Get or set the <xsl:output method= attribute. Valid arguments are 'html', 'text' and 'xml'

SYNOPSIS
 use XML::XSLT;

 my $xslt = XML::XSLT->new ($xsl, warnings => 1);

 $xslt->transform ($xmlfile);
 print $xslt->toString;

 $xslt->dispose();

DESCRIPTION
This module implements the W3C's XSLT specification. The goal is full implementation of this spec, but we have not yet achieved that. However, it already works well. See "XML::XSLT Commands" for the current status of each command.

XML::XSLT makes use of XML::DOM and LWP::Simple, while XML::DOM uses XML::Parser. Therefore XML::Parser, XML::DOM and LWP::Simple have to be installed properly for XML::XSLT to run.

Specifying Sources
The stylesheets and the documents may be passed as filenames, file handles regular strings, string references or DOM-trees. Functions that require sources (e.g. new), will accept either a named parameter or simply the argument.

Either of the following are allowed:

 my $xslt = XML::XSLT->new($xsl);
 my $xslt = XML::XSLT->new(Source => $xsl);

In documentation, the named parameter `Source' is always shown, but it is never required.

  METHODS

new(Source => $xml [, %args])
    Returns a new XSLT parser object. Valid flags are:

    DOMparser_args
        Hashref of arguments to pass to the XML::DOM::Parser object's parse method.

    variables
        Hashref of variables and their values for the stylesheet.

    base
        Base of URL for file inclusion.

    debug
        Turn on debugging messages.

    warnings
        Turn on warning messages.

    indent
        Starting amount of indention for debug messages. Defaults to 0.

    indent_incr
        Amount to indent each level of debug message. Defaults to 1.

open_xml(Source => $xml [, %args])
    Gives the XSLT object new XML to process. Returns an XML::DOM object corresponding to the XML.

    base
        The base URL to use for opening documents.

    parser_args
        Arguments to pase to the parser.

open_xsl(Source => $xml, [, %args])
    Gives the XSLT object a new stylesheet to use in processing XML. Returns an XML::DOM object corresponding to the stylesheet. Any arguments present are passed to the XML::DOM::Parser.

    base
        The base URL to use for opening documents.

    parser_args
        Arguments to pase to the parser.

process(%variables)
    Processes the previously loaded XML through the stylesheet using the variables set in the argument.

transform(Source => $xml [, %args])
    Processes the given XML through the stylesheet. Returns an XML::DOM object corresponding to the transformed XML. Any arguments present are passed to the XML::DOM::Parser.

serve(Source => $xml [, %args])
    Processes the given XML through the stylesheet. Returns a string containg the result. Example:

      use XML::XSLT qw(serve);

      $xslt = XML::XSLT->new($xsl);
      print $xslt->serve $xml;

    http_headers
        If true, then prepends the appropriate HTTP headers (e.g. Content-Type, Content-Length);

        Defaults to true.

    xml_declaration
        If true, then the result contains the appropriate <?xml?> header.

        Defaults to true.

    xml_version
        The version of the XML.

        Defaults to 1.0.

    doctype
        The type of DOCTYPE this document is. Defaults to SYSTEM.

toString
    Returns the result of transforming the XML with the stylesheet as a string.

to_dom
    Returns the result of transforming the XML with the stylesheet as an XML::DOM object.

media_type
    Returns the media type (aka mime type) of the object.

dispose
    Executes the "dispose" method on each XML::DOM object.

XML::XSLT Commands

xsl:apply-imports		no
    Not supported yet.

xsl:apply-templates		limited
    Attribute 'select' is supported to the same extent as xsl:value-of supports path selections.

    Not supported yet: - attribute 'mode' - xsl:sort and xsl:with-param in content

xsl:attribute			partially
    Adds an attribute named to the value of the attribute 'name' and as value the stringified content-template.

    Not supported yet: - attribute 'namespace'

xsl:attribute-set		yes
    Partially

xsl:call-template		yes
    Takes attribute 'name' which selects xsl:template's by name.

    Weak support: - xsl:with-param (select attrib not supported)

    Not supported yet: - xsl:sort

xsl:choose			yes
    Tests sequentially all xsl:whens until one succeeds or until an xsl:otherwise is found. Limited test support, see xsl:when

xsl:comment			yes
    Supported.

xsl:copy				partially
xsl:copy-of			limited
    Attribute 'select' functions as well as with xsl:value-of

xsl:decimal-format		no
    Not supported yet.

xsl:element			yes
xsl:fallback			no
    Not supported yet.

xsl:for-each			limited
    Attribute 'select' functions as well as with xsl:value-of

    Not supported yet: - xsl:sort in content

xsl:if				limited
    Identical to xsl:when, but outside xsl:choose context.

xsl:import			no
    Not supported yet.

xsl:include			yes
    Takes attribute href, which can be relative-local, absolute-local as well as an URL (preceded by identifier http:).

xsl:key				no
    Not supported yet.

xsl:message			no
    Not supported yet.

xsl:namespace-alias		no
    Not supported yet.

xsl:number			no
    Not supported yet.

xsl:otherwise			yes
    Supported.

xsl:output			limited
    Only the initial xsl:output element is used. The "text" output method is not supported, but shouldn't be difficult to implement. Only the "doctype-public", "doctype-system", "omit-xml-declaration", "method", and "encoding" attributes have any support.

xsl:param			experimental
    Synonym for xsl:variable (currently). See xsl:variable for support.

xsl:preserve-space		no
    Not supported yet. Whitespace is always preserved.

xsl:processing-instruction	yes
    Supported.

xsl:sort				no
    Not supported yet.

xsl:strip-space			no
    Not supported yet. No whitespace is stripped.

xsl:stylesheet			limited
    Minor namespace support: other namespace than 'xsl:' for xsl-commands is allowed if xmlns-attribute is present. xmlns URL is verified. Other attributes are ignored.

xsl:template			limited
    Attribute 'name' and 'match' are supported to minor extend. ('name' must match exactly and 'match' must match with full path or no path)

    Not supported yet: - attributes 'priority' and 'mode'

xsl:text				yes
    Supported.

xsl:transform			limited
    Synonym for xsl:stylesheet

xsl:value-of			limited
    Inserts attribute or element values. Limited support:

    <xsl:value-of select="."/>

    <xsl:value-of select="/root-elem"/>

    <xsl:value-of select="elem"/>

    <xsl:value-of select="//elem"/>

    <xsl:value-of select="elem[n]"/>

    <xsl:value-of select="//elem[n]"/>

    <xsl:value-of select="@attr"/>

    <xsl:value-of select="text()"/>

    <xsl:value-of select="processing-instruction()"/>

    <xsl:value-of select="comment()"/>

    and combinations of these.

    Not supported yet: - attribute 'disable-output-escaping'

xsl:variable			partial or from literal text in the stylesheet.
xsl:when				limited
    Only inside xsl:choose. Limited test support:

    <xsl:when test="@attr='value'">

    <xsl:when test="elem='value'">

    <xsl:when test="path/[@attr='value']">

    <xsl:when test="path/[elem='value']">

    <xsl:when test="path">

    path is supported to the same extend as with xsl:value-of

xsl:with-param			experimental
    It is currently not functioning. (or is it?)

SUPPORT
General information, bug reporting tools, the latest version, mailing lists, etc. can be found at the XML::XSLT homepage:

  http://xmlxslt.sourceforge.net/

DEPRECATIONS
Methods and interfaces from previous versions that are not documented in this version are deprecated. Each of these deprecations can still be used but will produce a warning when the deprecation is first used. You can use the old interfaces without warnings by passing new() the flag "use_deprecated". Example:

 $parser = XML::XSLT->new($xsl, "FILE",
                          use_deprecated => 1);

The deprecated methods will disappear by the time a 1.0 release is made.

The deprecated methods are :

output_string
    use toString instead

result_string
    use toString instead

output
    use toString instead

result
    use toString instead

result_mime_type
    use media_type instead

output_mime_type
    use media_type instead

result_tree
    use to_dom instead

output_tree
    use to_dom instead

transform_document
    use transform instead

process_project
    use process instead

open_project
    use "Source" argument to new() and transform instead.

print_output
    use serve() instead.

BUGS
Yes.

HISTORY
Geert Josten and Egon Willighagen developed and maintained XML::XSLT up to version 0.22. At that point, Mark Hershberger started moving the project to Sourceforge and began working on it with Bron Gondwana.

LICENCE
Copyright (c) 1999 Geert Josten & Egon Willighagen. All Rights Reserverd. This module is free software, and may be distributed under the same terms and conditions as Perl.

AUTHORS
Geert Josten <gjosten@sci.kun.nl>

Egon Willighagen <egonw@sci.kun.nl>

Mark A. Hershberger <mah@everybody.org>

Bron Gondwana <perlcode@brong.net>

Jonathan Stowe <jns@gellyfish.com>

SEE ALSO
XML::DOM, LWP::Simple, XML::Parser

POD ERRORS
Hey! The above document had some coding errors, which are explained below:

Around line 880:
    '=item' outside of any '=over'

Around line 3581:
    You forgot a '=back' before '=head1'