Online xml validating parser
The DOM specification should probably make both available because neither approach can address all problems.
There weren't many obvious failures here: Accepting illegal characters is likely to cause the most interoperability problems of those failures. DLL processor raises issues that the OASIS/NIST tests should address, in some cases by changing the tests: It is interesting that the first issue above, regarding the constraint on unused general entities to be well-formed, may be coupled to the use of DOM as the processor API in this case.It is very necessary to know about valid XML document before knowing XML validation.A DTD defines the legal elements of an XML document In simple words we can say that a DTD defines the document structure with a list of legal elements and attributes. Actually DTD and XML schema both are used to form a well formed XML document.These need to be worked around, otherwise exceptions, reflecting internal errors of some kind, are thrown by some DOM operations: In addition, I noticed that in this DOM, the SYSTEM identifiers found in Entity nodes are not resolved.
Several other DOM implementations provide such IDs in fully resolved form, making less work for applications that need to use such URIs.
Only DOM implementations, or similar APIs, that expose such contents appear to get any benefit from having such a well-formedness constraint. DLL processor's DOM output into something that could be examined for correctness had an unanticipated side effect.