XOM API for Processing XML with Java

[Wolfgang Hoschek <whoschek AT lbl.gov>]

In order to have XML docs easily human readable, I'm trying to remove as 
much namespace clutter as possible from third-party XML documents 
autogenerated and merged from multiple sources.

Does anyone know rules and/or code that removes redundant namespace 
declarations in XML documents, either by strictly retaining semantics or 
by slighly relaxing them?

Possibly by reusing prefixes already declared "further up", by moving 
common namespace declarations into parent elements, by renaming prefixes 
that refer to the same namespace, by removing prefixes that refer to the 
default namespace, etc. This seems to be not so trivial.

Any pointers to related discussions, rules and/or [xom] code?

Thanks for any help,
Wolfgang.