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Current text "References XML Schema does not have any support for inter-document references, although it does support intra-document references through xs:ID, xs:IDREF, xs:key and xs:keyref. Inter-document references are fundamental to SML since a document is a unit of versioning. SML extends XML Schema to support inter-document references and a set of constraints on inter-document references." The last sentence could be read to imply that SML defines ONLY cross-document refs (not true, as we know) and that its constraints ONLY apply to cross-document refs (also untrue). Proposal: change last sentence above from "...inter-document references and a set of constraints on inter-document references" to "...references that may cross document boundaries, and a set of constraints on those references that apply regardless of whether they cross document boundaries or not."