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Extensible Markup Language (XML) 1.0 (Fourth Edition)
W3C Recommendation 16 August 2006
http://www.w3.org/TR/2006/REC-xml-20060816/#sec-documents
Each XML document has:
physical structure -
documents is composed of units called
Entities
"root" or document entity
entity1
entity2
.......
Logical structure:
elements
declarations
comments
processing instructions
character references
Are these well-formed comments?
<!-- declarations for <head> & <body> -->
<!--- declarations for <head> & <body> -->
<!-- declarations for <head> & <body> --->
<!--- declarations for <head> & <body>- -->
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