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

       XML::Grove::Sub - run a filter sub over a grove

	use XML::Grove::Sub;

	# Using filter method on XML::Grove::Document or XML::Grove::Element:
	@results = $grove_object->filter(\&sub [, ...]);

	# Using an XML::Grove::Sub instance:
	$filterer = XML::Grove::Sub->new();
	@results = $grove_object->accept($filterer, \&sub [, ...]);

       "XML::Grove::Sub" executes a sub, the filter, over all objects in a grove and returns a
       list of all the return values from the sub.  The sub is called with the grove object as
       it's first parameter and passing the rest of the arguments to the call to `"filter()"' or

       The following filter will return a list of all `"foo"' or `"bar"' elements with an
       attribute `"widget-no"' beginning with `"A"' or `"B"'.

	 @results = $grove_obj->filter(sub {
	     my $obj = shift;

	     if ($obj->isa('XML::Grove::Element')
		 && (($obj->{Name} eq 'foo')
		     || ($obj->{Name} eq 'bar'))
		 && ($obj->{Attributes}{'widget-no'} =~ /^[AB]/)) {
		 return ($obj);
	     return ();

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

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

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

perl v5.16.3				    1999-09-02			       XML::Grove::Sub(3)
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