Simply create a new XML::NamespaceFactory object with the namespace you
wish to use as its single parameter. If you wish to use the empty
namespace, simply pass in an empty string (but undef will not do).

Then, when you want to get a JClark name, call a method on that object the
name of which is the local name you wish to have. It'll return the JClark
notation for that local name in your namespace.

Unfortunately, some local names legal in XML are not legal in Perl. To
circumvent this, you can use the hash notation in which you access a key on
the object the name of which is the local name you wish to have. This will
work just as the method call name but will accept more characters. Note
that it does not check that the name you ask for is a valid XML name. This
form is more general but slower.