2.1.1741 Part 1 Section 22.8.2.1, ST_RelationshipId (Explicit Relationship ID)
a. The standard does not limit the length of the contents of the ST_RelationshipId simple type.
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Office restricts the contents of this simple type to be at most 255 characters.
b. The standard states that the values of the ST_RelationshipId simple type are a restriction on the XML Schema string datatype.
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Office defines this simple type as being a restriction on the XML Schema id datatype.