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package XML::Validator::Schema::Node;
use base qw(Tree::DAG_Node);
=head1 NAME
XML::Validator::Schema::Node - base class
=head1 DESCRIPTION
Base class for nodes in the schema tree. Used by both temporary nodes
resolved during compilation (ex. ::ModelNode) and permanent nodes
(ex. ::ElementNode).
This is an abstract base class and may not be directly instantiated.
=cut
sub new {
my $pkg = shift;
croak("Illegal attempt to instantiate a Node directly!")
if $pkg eq __PACKAGE__;
return $pkg->SUPER::new(@_);
}
sub parse {
my $pkg = shift;
croak("$pkg neglected to supply a parse() implementation!");
}
# override to declare root-ness
sub is_root {
return 0 if shift->{mother};
return 1;
}
1;
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