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   XML errors and fatal errors.

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  • From: John Cowan <cowan@locke.ccil.org>
  • To: XML Dev <xml-dev@ic.ac.uk>
  • Date: Wed, 05 Aug 1998 15:35:51 -0400

As I posted before, there are three classes of fatal errors
mentioned in the XML recommendation:

	violations of well-formedness constraints (when detectable);
	declaration of a encoding which the processor cannot process;
	invalid references to entities.

I find also the following 20 kinds of non-fatal errors:

	violations of validity constraints;
	unescaped & or < in character data;
	unescaped > in "]]>" that is not the end of a CDATA section;
	-- within comment;
	DOCTYPE declaration that is not before the first element;
	DTD that contains text other than markup declarations;
	"standalone='no'" in a non-standalone document;
	xml:space declared as other than type "(default|preserve)"
	user-defined language id not beginning with "x-";
	2-letter language id not from ISO 639;
	text declaration provided by reference to a parsed entity;
	text declaration not at the beginning of an entity;
	UTF-16 encoded entity doesn't begin with BOM;
	parsed entity not encoded in UTF-8 or UTF-16 lacks encoding declaration;
	encoding declaration doesn't agree with actual encoding;
	built-in entities declared incorrectly;
	system identifier contains fragment identifier (optional error);
	non-deterministic content model;
	non-supported XML version (optional error);
	version number is "1.0" but document conforms to another version;

This list was compiled by looking at occurrences of "error" and "must".
Not all "must"s appear here: "must"s that constrain the processor
rather than the document are omitted, as are definitional "must"s
like "If an element is empty, it must be represented either by a
start-tag immediately followed by an end-tag or by an empty-element
tag", where "must" really means "is".

John Cowan	http://www.ccil.org/~cowan		cowan@ccil.org
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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