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Current XSD entry for acyclic is: <xs:attribute name="acyclic" type="xs:boolean"> <xs:annotation> <xs:documentation> If this attribute is set to true for a type D then instances of D should not create any cycles in a model. More precisely, the directed graph whose edges represent instances of D, and whose nodes represent documents that contain the source or target elements for instances of D, must be acyclic. </xs:documentation> </xs:annotation> </xs:attribute> The statement in the xs:documentation beginning with "More precisely," is obsolete. It should be: More precisely, the directed graph whose edges represent instances of D, and whose nodes represent elements resolved by the SML references of the type D or of types derived from D, must be acyclic. which reflects section 5.1.1.3 item 1.
Telecon of 2009-04-13: fix as proposed, editors to incorporate section number of original text, and license given for editorial cleanup. No need for further wg review was expressed.
The text now reads: If this attribute is set to true for a type D then instances of D should not create any cycles in a model. See Section 5.1.1.3 titled "Instance Validity Rules". I removed the new suggested sentence since I don't think there is any point in covering material in the referenced section. In particular, the suggested sentence covers item 1 in the referenced section but not item 2 in the section.