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XML::Grove::Subst(3)	       User Contributed Perl Documentation	     XML::Grove::Subst(3)

       XML::Grove::Subst - substitute values into a template

	use XML::Grove::Subst;

	# Using subst method on XML::Grove::Document or XML::Grove::Element:
	$new_grove = $source_grove->subst( ARGS );
	$new_grove = $source_grove->subst_hash( ARG );

	# Using an XML::Grove::Subst instance:
	$subster = XML::Grove::Subst->new();
	$new_grove = $subster->subst( $source_grove, ARGS );
	$new_grove = $subster->subst_hash( $source_grove, ARG );

       "XML::Grove::Subst" implements XML templates.  "XML::Grove::Subst" traverses through a
       source grove replacing all elements with names `"SUB:XXX"' or `"SUB:key"' with their cor-
       responding values from ARGS (a list) or ARG (a hash), repsectively.

       $grove_obj->subst( ARGS ) =item $subster->subst( $grove_obj, ARGS )
	   Search for `"SUB:XXX"' elements, where XXX is an array index, and replace the element
	   with the value from ARGS, a list of values.	The return value is a new grove with the
	   substitutions applied.

       $grove_obj->subst_hash( ARG ) =item $subster->subst_hash( $grove_obj, ARG )
	   Search for `"SUB:key"' elements and replace the element with the value from ARG, a
	   hash of values.  The hash key is taken from the `"key"' attribute of the `"SUB:key"'
	   element, for example, `"<SUB:key key='foo'>"'.  The return value is a new grove with
	   the substitutions applied.

       The following template, in a file `"template.xml"', could be used for a simple parts data-
       base conversion to HTML:

	       <title><SUB:key key='Name'></title>
	       <h1><SUB:key key='Name'></title>
	       <p>Information for part number <SUB:key key='Number'>:</p>
	       <SUB:key key='Description'>

       To use this template you would first parse it and convert it to a grove, and then use
       `"subst_hash()"' every time you needed a new page:

	   use XML::Parser::PerlSAX;
	   use XML::Grove;
	   use XML::Grove::Builder;
	   use XML::Grove::Subst;
	   use XML::Grove::PerlSAX;
	   use XML::Handler::XMLWriter;

	   # Load the template
	   $b = XML::Grove::Builder->new();
	   $p = XML::Parser::PerlSAX->new( Handler = $b );
	   $source_grove = $p->parse( Source => { SystemId => 'template.xml' } );

	   # Apply the substitutions
	   $new_grove = $source_grove->subst_hash( { Name => 'Acme DCX-2000 Filter',
						     Number => 'N4728',
						     Description => 'The Best' } );

	   # Write the new grove to standard output
	   $w = XML::Handler::XMLWriter->new();
	   $wp = XML::Grove::PerlSAX->new( Handler => $w );
	   $wp->parse( Source => { Grove => $new_grove } );

       Ken MacLeod, ken@bitsko.slc.ut.us

       perl(1), XML::Grove(3)

       Extensible Markup Language (XML) <http://www.w3c.org/XML>

perl v5.8.0				    1999-08-25			     XML::Grove::Subst(3)
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