I think <attDef ident="sonOfODD"> <datatype minOccurs="1" maxOccurs="2"> <rng:ref name="data.enumerated"/> </datatype> <valList type="closed"> <valItem ident="one"/> <valItem ident="two"/> <valItem ident="three"/> <valItem ident="four"/> </valList> </attDef> <attDef ident="pureODD"> <datatype minOccurs="1" maxOccurs="2"> <dataRef key="myValList"/> </datatype> </attDef> </attList> <dataSpec ident="myValList"> <valList type="closed"> <valItem ident="a"/> <valItem ident="b"/> <valItem ident="c"/> <valItem ident="d"/> </valList> </dataSpec> Although I'm not sure why a <valList> can't go directly in a <datatype> now that we let TEI namespaced things in there.

Can someone please remind me how to declare an attribute such that its content can be one or more of a set of values drawn from a fixed list? In other words, a closed valList, but allowing more than one item from the list.

I'm sure I must have done this before, but I can't remember it.