Support use XML::XPath some_version;
and modernize inheritance.
#11
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Leverages Exporter's version checking even though it doesn't actually
export anything. Also replaces obsolescent
use vars
withour
forpackage variables, and manual setting of
@ISA
withuse parent
pragmas.
Did require bumping the minimum version from 5.8 to 5.10.1 for the
parent pragma.