PR 132: Add a p:document-class function

XProc specifications published by continuous integration on 10 May 2026 for PR 132.

Fix #41

This name seems shorter and simpler than the names proposed in the issue. Rather than raise a dynamic error for invalid media types, I opted to simply return the empty sequence. I don’t feel strongly about it.

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Commit: 25a238d7e3b0993e399f408f32a95609e8a9713c