Re: questions about entities and entity declarations
On Wed, 25 Sep 96 21:11:03 EDT, firstname.lastname@example.org wrote:
>> The ISO character entity *sets* are external entities, but the entity
>> declarations within them declare *internal* SDATA entities. They would
>> have to be redeclared as you say if we are to exclude internal SDATA
>I am probably being obtuse here, but how would I refer to (for example)
>a symbol that has no Unicode or ISO10646 code point? For example, suppose
>I need an r-cedilla... in SGML I've used SDATA entities for that.
>I'd be quite happy with an alternative.
A symbol that is not in the character set would be like any other graphic; use
an external NDATA entity. That gives you an opportunity to declare the notation
explicitly (and data attributes for it), which SDATA doesn't provide.
Remember that SGML has never required a separate file for external entities.
With Formal System Identifiers, we can now formally specify when we are using
container Storage Managers that let multiple entities occur in the same storage
object (e.g., TAR, PKZIP, MIME).
If you don't like using external NDATA for this purpose, we could agree to allow
internal SDATA entities in XML. If so, we would probably want a convention, such
as the one proposed for PIs, that would identify the notation for the SDATA
Charles F. Goldfarb * Information Management Consulting * +1(408)867-5553
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