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2. Preliminaries This section does not include the customary definitions of terms such as "may", etc.
The Formal Semantics document does not use words such as "must", "may", and "should" in the sense of RFC 2119. Instead, FS refers to the specifications that use it (e.g., XQuery 1.0, XSLT 2.0, XPath 2.0) for conformance criteria. Those documents spell out the meaning of these words, which are then imposed on Formal Semantics wherever appropriate. This is the official response of the XML Query WG and XSL WG. We appreciate your feedback on the XML Query specifications. Please let us know if this response is satisfactory. If not, please respond to this message, explaining your concerns. If so, please mark the comment CLOSED.