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Subject: xml-parse-attlist should be more flexible in parsing attributes
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xml-parse-attlist fails to parse empty attributes.

Specifically, it will not parse

    <element att="">stuff</element>

To fix, replace

      (unless (looking-at "\"\\([^\"]+\\)\"")
	(unless (looking-at "'\\([^']+\\)'")
	  (error "XML: Attribute values must be given between quotes")))

with

      (unless (looking-at "\"\\([^\"]*\\)\"")
	(unless (looking-at "'\\([^']*\\)'")
	  (error "XML: Attribute values must be given between quotes")))