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Graphics
Property value
restrictions
-
Classes are created by restricting
the property
values on a superclass
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For example: how would I characterize a “listed price”?
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- it is a price (which may be a general term), but one that is
given in one of the “allowed” currencies (say, €, £, or $)
- more formally:
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- the value of “p:currency”, when applied to a resource on
listed price, must
take one of those values…
- …thereby defining the class of “listed price”