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Section 5.1.1.3, Instance Validity Rules, says: "1) The nodes in the graph are all the elements resolved to by SML references of type CT or types derived from CT." The XML Query WG would like to know whether a Complex Type without SML references is allowed to specify "sml:acyclic="true""?
Section 5.1.1 states that "Model validators MUST support the sml:acyclic attribute on any <xs:complexType> element in a schema document." There is no restriction to only complexTypes that allow the sml:ref attribute (indicating an SML reference). See also Table 5.2.
Thanks you for this clarification. Your response satisfies our comment.