[tdwg-content] Use of TCS [SEC=UNCLASSIFIED]

[Gregor Hagedorn]

About the problem of being unable to use fragments: SDD provides two
root schemata, one that allows only valid "complete" datasets, another
allowing fragments. ("object interchange..."). Under the assumptions
of xml-schema, it is perfectly legal to have schema-validation
variants for differnt purposes.

It was originally planned to merge the xml-standards (TCS, SDD, ABCD)
into one unified one, thus introducing such mechanisms (and extension
mechanisms like in SDD) into all. This was stopped by the TDWG
executive in favor of redesigning everything as RDF vocabularies
instead of xml-schema.  So the xml-schema standards are somewhat poor
orphans... :-)

Gregor