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At 12:58 PM -0500 2/23/03, Karl Waclawek wrote:
>I don't think complete validation is possible on top of SAX.
>AFAIR, there are a few entity related validity constraints that
>cannot be checked through SAX.
Interesting. Looking at the spec, I only see one such validity
constraint that would seem to apply:
Validity constraint: Entity Declared
In a document with an external subset or external parameter entities
with "standalone='no'", the Name given in the entity reference must
match that in an entity declaration. For interoperability, valid
documents should declare the entities amp, lt, gt, apos, quot, in the
form specified in 4.6 Predefined Entities. The declaration of a
parameter entity must precede any reference to it. Similarly, the
declaration of a general entity must precede any attribute-list
declaration containing a default value with a direct or indirect
reference to that general entity.
This leaves open the question of what a non-validating parser that
reads the DTD is supposed to do when it sees a parameter entity
reference before that entity is defined or an attribute-list
declaration containing a default value with a direct or indirect
reference to a general entity which is not yet defined. My best guess
is that it must then start acting like a non-DTD resolving parser,
and not process anything that occurs after the parameter entity
reference, but that's just a guess.
I'll have to write some experiments and see what non-validating
parsers actually do in this case.
--
+-----------------------+------------------------+-------------------+
| Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer |
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| Processing XML with Java (Addison-Wesley, 2002) |
| http://www.cafeconleche.org/books/xmljava |
| http://www.amazon.com/exec/obidos/ISBN%3D0201771861/cafeaulaitA |
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| Read Cafe au Lait for Java News: http://www.cafeaulait.org/ |
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