Example: the XOL meta model (Karp, Chaudhri & Thomere ’99)

• class ? slot ? individual

<class>

<name> part </name>

</class>

<slot>

<name> part-id </name>

<domain> part </domain>

<value-type> integer </value-type>

<numeric-min> 1000000 </numeric-min>

<numeric-max> 9999999 </numeric-max>

</slot>

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