Constraints on Attvalues
cowan at locke.ccil.org
Thu Aug 27 17:28:22 BST 1998
Peter Jones scripsit:
> So for my element:
> <myelem attrib="&ent;"/>
> &ent; can only refer to an internally declared entity, and the literal
> in the entity value, EntValue, cannot contain
> where &Another_ent; is an external general entity.
You are quite right, provided you keep firmly in mind the distinction
between *being* an internal or external entity, and being
internally or externally *declared*.
Internal entities are those whose replacement text appears in the
declaration, and external entities are those whose replacement text
is referenced by a URI or Publicid. Either kind can be declared
either internally (in the internal subset) or externally (in the
external subset or in an external parameter entity).
It's the first property (*being* an external entity) that is forbidden
in references from attribute values. External parsed entities can only
be referenced from content.
John Cowan cowan at ccil.org
e'osai ko sarji la lojban.
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