- the attrs value may be re-used by the parser, so the implementation
cannot rely on owning the object.
- an element with no namespace encountered in namespace mode will have a URI
of None, not "" (startElementNS() only).
Fixed a couple of minor markup issues as well.
<loewis@informatik.hu-berlin.de>.
Reorganized to be more like other parts of the documentation in its
arrangement, but with few content changes.
This closes SourceForge patch #101850.