Doc::Perlish::DOM::PI - a processing instruction in a Perldoc::DOM tree

See Doc::Perlish::DOM::Node.

These nodes can be used to, eg, note to the Pod::Writer that an upcoming closing node is to be represented in a certain non-normative way in the source.

A processing instruction is represented very much like an element, except that it cannot contain sub-nodes like an element can.

Note: this restriction is currently not enforced by the DOM interface.