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EPrints 3 Reference: Directory Structure - Metadata Fields - Repository Configuration - XML Config Files - XML Export Format - EPrints data structure - Core API - Data Objects


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EPrints::XML - XML Abstraction Module

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For preference, use the methods in EPrints::Handle::XML


 $string = EPrints::XML::to_string( $node, "utf-8", 1 ); #use this to convert DOM trees to string
 $dom = EPrints::XML::parse_xml_string( $string );
 $dom = EPrints::XML::parse_xml( $file, $basepath, $no_expand );
 $boolean = is_dom( $node, @nodestrings );
 $newnode = EPrints::XML::clone_node( $node, $deep );
 EPrints::XML::write_xhtml_file( $node, $filename );
 $document = EPrints::XML::make_document();
 $dom = EPrints:XML::parse_url($url, $no_expand);

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EPrints can use either XML::DOM, XML::LibXML or XML::GDOME modules to generate and process XML. Some of the functionality of these modules differs so this module abstracts such functionality so that all the module specific code is in one place.

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$doc = EPrints::XML::parse_xml_string( $string );

Return a DOM document describing the XML string %string.

If we are using GDOME then it will create an XML::GDOME document instead.

In the event of an error in the XML file, report to STDERR and return undef.

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$doc = EPrints::XML::parse_xml( $file, $basepath, $no_expand )

Return a DOM document describing the XML file specified by $file. With the optional root path for looking for the DTD of $basepath. If $noexpand is true then entities will not be expanded.

If we are using GDOME then it will create an XML::GDOME document instead.

In the event of an error in the XML file, report to STDERR and return undef.

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event_parse( $fh, $handler )

Parses the XML from filehandle $fh, calling the appropriate events in the handler where necessary.

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$boolean = is_dom( $node, @nodestrings )

return true if node is an object of type XML::DOM/GDOME::$nodestring
where $nodestring is any value in @nodestrings.
if $nodestring is not defined then return true if $node is any 
XML::DOM/GDOME object.

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EPrints::XML::dispose( $node )

Dispose of this node if needed. Only XML::DOM nodes need to be disposed as they have cyclic references. XML::GDOME nodes are C structs.

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$newnode = EPrints::XML::clone_node( $node, $deep )

Clone the given DOM node and return the new node. Always does a deep copy.

This function does different things for XML::DOM & XML::GDOME but the result should be the same.

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$newnode = EPrints::XML::clone_and_own( $doc, $node, $deep )

This function abstracts the different ways that XML::DOM and XML::GDOME allow objects to be moved between documents.

It returns a clone of $node but belonging to the document $doc no matter what document $node belongs to.

If $deep is true then the clone will also clone all nodes belonging to $node, recursively.

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$string = EPrints::XML::to_string( $node, [$enc], [$noxmlns] )

Return the given node (and its children) as a UTF8 encoded string.

$enc is only used when $node is a document.

If $stripxmlns is true then all xmlns attributes and namespace prefixes are removed. Handy for making legal XHTML.

Papers over some cracks, specifically that XML::GDOME does not support toString on a DocumentFragment, and that XML::GDOME does not insert a space before the / in tags with no children, which confuses some browsers. Eg. <br/> vs <br />

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$document = EPrints::XML::make_document()

Create and return an empty document.

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EPrints::XML::write_xml_file( $node, $filename )

Write the given XML node $node to file $filename.

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EPrints::XML::write_xhtml_file( $node, $filename )

Write the given XML node $node to file $filename with an XHTML doctype.

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EPrints::XML::tidy( $domtree, { collapse=>['element','element'...] }, [$indent] )

Neatly indent the DOM tree.

Note that this should not be done to XHTML as the differenct between white space and no white space does matter sometimes.

This method modifies the tree it is given. Possibly there should be a version which returns a new version without modifying the tree.

Indent is the number of levels to ident by.

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$namespace = EPrints::XML::namespace( $thing, $version )

Return the namespace for the given version of the eprints xml.

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$v = EPrints::XML::version()

Returns a string description of the current XML library and version.

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$dom = EPrints:XML::parse_url($url, $no_expand)

Return a DOM document found at the URL

$url - the url which resolves to the XML you wish to parse.

$no_expand - set to 1 if you do not want the xml to be indented.

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