Reference_Syntax.relation (Acrobat 8.x and later)
Reference_Syntax.relation = “ordered | unordered | choice” (Acrobat 7.x and earlier)
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ordered (default)
Instantiates members in the order in which they are declared in the form design. This has the effect of potentially re-ordering the content to satisfy the document order of the form design.
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Instantiates the members in data order regardless of the order in which they are declared. This has the effect of potentially re-ordering the set to satisfy the ordering of the content.
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The members are exclusive of each other, and only one member may be instantiated. The determination of which member to instantiate is based upon the data.
Form Model

relation