[cat01]
Every @href in a catalog.tan.xml file must point to a document that is available.
@href
Affects: @href
Used by template ŧ tan:catalog-expansion-terse, ŧ tan:cut-faulty-hrefs.
ŧ tan:catalog-expansion-terse
ŧ tan:cut-faulty-hrefs
Used by function tan:collection().
tan:collection()