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The MOF Package, Class, and Association concepts have been classified as ‘major’ concepts, warranting an introduction for
their instances. The introduction is a simple one, consisting of the name of the Class, Package, or Association and some identifying
string. (When translating from XMI, the XMI ID provides a logical and automatically unique identifier). The appearance of
this introduction is very similar to the introductions of procedures or functions in Pascal or C. Curly braces, as used in
many languages deriving syntactic features from C, are used to delimit the bodies of these major concepts. Class instances
can also be referenced by other parts of the document. This is done by simply displaying the introduction of the instance
without the body.