At 3:28 PM 1/23/97, lee@sq.com wrote: >David Durand writes: >> But SYSTEM IDs should not be included. In SGML, they are reserved for >> "non-portable" identifiers, >No. They are system specific. They are not _required_ to be non-portable. >SGML makes no promise that they are portable. but certainly does not say >that any document using a portable SYSTEM identiifier is invalid!!! A SYSTEM identifier is _always_ non-protable, because I am not _required_ to implement any semantics for SYSTEM identifiers. >For XML, it would be possible and acceptable to requre specific forms of >system identifiers in certain places, and in fact we have already done so >by using URLs. Eliot's query was about a potential SGML feature. So I answered in terms of SGML. Actually, in SGML there's a bit better case because of FSIs, but even there, it's thin. In XML I think the case is worse, since a URL is well-known to be a transient thing. But as this is not an XML issue, we should abandon it. -- David I am not a number. I am an undefined character. _________________________________________ David Durand dgd@cs.bu.edu \ david@dynamicDiagrams.com Boston University Computer Science \ Sr. Analyst http://www.cs.bu.edu/students/grads/dgd/ \ Dynamic Diagrams --------------------------------------------\ http://dynamicDiagrams.com/ MAPA: mapping for the WWW \__________________________Received on Thursday, 23 January 1997 22:10:37 EST
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