ISO Schematron beginners question: including multiple patterns

Hello,

as far as I can see, with Schematron it is not possiple to include
multiple sch:patterns from an external file - sch:include accepts only
well formed xml, and there is no grouping element (like <define/> in
RelaxNG) to surround multiple sch:patterns.

Did I miss something? Have you any suggestions for a workaround?

Thanks,

Stefan