XMI24 — Section 4.5.1

4.5.1: should state that there is a standard file XMI.xsd (with an OMG document number) that contains the elements for the XMI model and the elements referred to here: "In addition, there are attribute declarations and attributeGroup declarations that must be imported."

Replace the last sentence in the first paragraph of section 4.5.1which current reads:
The version of this XMI specification is 2.1, and its XMI namespace is “http://schema.omg.org/spec/XMI/2.1.”
with:
The version of this XMI specification is 2.1.1, and its XMI namespace is “http://schema.omg.org/spec/XMI/2.1.1", and the XSD file can be found at "http://schema.omg.org/spec/XMI/20071001/07-10-06.xsd."