Define no-overlaps constraint based on two integers (range index?)

[Michael Ludwig]

Michael and Adam,

thanks for your answers.

Michael Ludwig schrieb:
> I'm not sure what this kind of index is called; I thought of
> "contiguity index", or "range index", or "interval index", but
> can't find much in Google.

In an SQL server, it's a CHECK clause plus two indices on the INTEGER
columns, and that's about what it translates to in an XQuery server.
Maybe this is too simple to merit a name of its own.

Michael Ludwig