A single xml attribute definition in an attlist in xml::dom
XML::DOM::AttDef extends XML::DOM::Node, but is not part of the \s-1DOM\s0 Level 1 specification.
Each object of this class represents one attribute definition in an AttlistDecl.
\$1
Returns the attribute name.
Returns the default value, or undef.
Whether the attribute value is fixed (see #FIXED keyword.)
Whether the attribute value is required (see #REQUIRED keyword.)
Whether the attribute value is implied (see #IMPLIED keyword.)