* automated/xml-parse-tests.el (xml-parse-tests--qnames): New
variable to hold test data for name expansion.
(xml-parse-tests): Test the two different types of name expansion.
* xml.el (xml--parse-buffer): Use xml-syntax-table.
(xml-parse-tag): Likewise, and avoid changing entity tables.
(xml-syntax-table): Define from scratch, making sure not to give
x2000 and other Unicode spaces whitespace syntax, since those are
not spaces in XML.
(xml-parse-fragment): Delete unused function.
(xml-name-start-char-re, xml-name-char-re, xml-name-re)
(xml-names-re, xml-nmtoken-re, xml-nmtokens-re, xml-char-ref-re)
(xml-entity-ref, xml-pe-reference-re)
(xml-reference-re,xml-att-value-re, xml-tokenized-type-re)
(xml-notation-type-re, xml-enumeration-re, xml-enumerated-type-re)
(xml-att-type-re, xml-default-decl-re, xml-att-def-re)
(xml-entity-value-re): Use syntax references in regexps where
possible; no need to define inside a let-binding.
(xml-parse-dtd): Use xml-pe-reference-re.
(xml-entity-or-char-ref-re): New defconst.
(xml-parse-string, xml-substitute-special): Use it.
(xml-entity-expansion-limit): New variable.
(xml-parse-string, xml-substitute-special): Use it.
(xml-parse-dtd): Avoid infloop if the DTD is not terminated.
* test/automated/xml-parse-tests.el: Update testcases.
(xml-default-ns): New variable.
(xml-entity-alist): Use XML spec definitions for lt and amp.
(xml-parse-region): Make first two arguments optional. Discard
text properties.
(xml-parse-tag-1): New function, spun off from xml-parse-tag. All
callers changed.
(xml-parse-tag): Call xml-parse-tag-1. For backward
compatibility, this function should not modify buffer contents.
(xml-parse-tag-1): Fix opening-tag regexp.
(xml-parse-string): Rewrite, handling entity and character
references properly.
(xml--entity-replacement-text): Signal an error if a parameter
entity is undefined.
* test/automated/xml-parse-tests.el (xml-parse-tests--data): More
testcases.
* test/automated/xml-parse-tests.el: New file.
* lisp/xml.el (xml--parse-buffer): New function. Move most of
xml-parse-region here.
(xml-parse-region): Copy region into a temporary buffer, since
parameter entity substitution requires changing buffer contents.
Use xml--parse-buffer.
(xml-parse-file): Use xml--parse-buffer.
(xml-parse-dtd): Make parameter entity substitution work right.
