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The last sentence of Section 7, "XPath 1.0 Expression Language", reads: "An XPath 1.0 expression MAY evaluate to multiple nodes; because of this the XPath 1.0 language MUST NOT be used with a "Put" or "Create" operation." (1) There is no such thing as a WS-Frag "Create" operation. (2) This means that no expression language that returns more than one node can be used with the "Put" operation. This needs to be said in a generic section at the beginning so that anyone who tries to extend the spec with their own expression language is aware of this.
already resolved as part of other issues, overtaken