Subject: RE: SUMMARY: XML Validation Issues (was: several threads) From: "Jelks Cabaniss" <jelks@xxxxxxxx> Date: Mon, 12 Apr 1999 14:00:19 -0400 |
Chris Lilley wrote: > > > My feeling is that there are three classes of implementation, that > > > should all have names: > > > > > > minimal well-formed - never tries to follow external entities > > > full well-formed - always tries to follow external entities > > > full validating - always tries to follow external entities and validates > > Agreed. ... > > > and it should be possible to always derive what class of implementation > > > a particular instance requires. > You don't comment on that sentence, so does it mean you agree? Yes. But see below. > > If there is to be a way to *force* validity by specifying it in the document > > instance, the only way I can see is by amending the spec with > > something like (as I believe you yourself suggested in passing) > > valid="yes" in the declaration. > > Right. With a default of "no", of course. So, this would make the > assertion that the document was valid and that assertions could be > tested and perhaps refuted, by a validating parser. In the case of > "valid="no" or perhaps, valid="wf", a validating parser would do what - > declare the document invalid? Agree, yes, its invalid (so why check it)? > Automatically use a non-validating mode, even if it was normally > validating? > Next question, should there be (in other words, is this something that > should be in the document instance). Yes. But how to do it? If XML 1.1 has a "valid='yes'|'no'" in the declaration, XML 1.1 documents may break when running under an XML 1.0 parser, since the XML 1.0 BNF clearly states what can and can't be in the declaration. Maybe a PI could be formalized similar to the way the stylesheet linking is being done: <?xml-assert implementation="valid"?> (could also be "minimal" or "full" for the well-formed only options you mentioned). /Jelks XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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