RDFS terms used in non-schemas

The RDFS spec states:

    The abstract RDF Schema core vocabulary can be used to make RDF
    statements defining and describing application-specific vocabularies
    such as the Dublin Core Element Set.

Perhaps it should also be added that the portion of the vocabulary not
defined as a ConstraintResource can be used in non-schema applications also.
The spec defines a number of useful terms (label, comment, seeAlso, etc.)
but seems to be discouraging their use outside of schemas.

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