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.\" ========================================================================
.\"
.IX Title "XML::LibXML::AttributeHash 3"
.TH XML::LibXML::AttributeHash 3 "2021-04-17" "perl v5.26.3" "User Contributed Perl Documentation"
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.SH "NAME"
XML::LibXML::AttributeHash \- tie an XML::LibXML::Element to a hash to access its attributes
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\& tie my %hash, \*(AqXML::LibXML::AttributeHash\*(Aq, $element;
\& $hash{\*(Aqhref\*(Aq} = \*(Aqhttp://example.com/\*(Aq;
\& print $element\->getAttribute(\*(Aqhref\*(Aq) . "\en";
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This class allows an element's attributes to be accessed as if they were a
plain old Perl hash. Attribute names become hash keys. Namespaced attributes
are keyed using Clark notation.
.PP
.Vb 4
\& my $XLINK = \*(Aqhttp://www.w3.org/1999/xlink\*(Aq;
\& tie my %hash, \*(AqXML::LibXML::AttributeHash\*(Aq, $element;
\& $hash{"{$XLINK}href"} = \*(Aqhttp://localhost/\*(Aq;
\& print $element\->getAttributeNS($XLINK, \*(Aqhref\*(Aq) . "\en";
.Ve
.PP
There is rarely any need to use XML::LibXML::AttributeHash directly. In
general, it is possible to take advantage of XML::LibXML::Element's
overloading. The example in the \s-1SYNOPSIS\s0 could have been written:
.PP
.Vb 2
\& $element\->{\*(Aqhref\*(Aq} = \*(Aqhttp://example.com/\*(Aq;
\& print $element\->getAttribute(\*(Aqhref\*(Aq) . "\en";
.Ve
.PP
The tie interface allows the passing of additional arguments to
XML::LibXML::AttributeHash:
.PP
.Vb 1
\& tie my %hash, \*(AqXML::LibXML::AttributeHash\*(Aq, $element, %args;
.Ve
.PP
Currently only one argument is supported, the boolean \*(L"weaken\*(R" which (if
true) indicates that the tied object's reference to the element should be
a weak reference. This is used by XML::LibXML::Element's overloading. The
\&\*(L"weaken\*(R" argument is ignored if you don't have a working Scalar::Util::weaken.