XML is markup
Text plus tags
There's nothing magical about XML. It uses the same notion
of tags intermingled with text that was used in SGML, HTML, and a
number of other languages. The text provides the content, the tags
provide the names and structures that apply to that content.
Labels as types
XML 1.0 has very little built-in notion of types, though it
supports a few pieces (like ID, IDREF, and IDREFS) which provide
additional constraints on content. Instead of saying "this is an
integer", XML might say "this is a population" and the program would
have to know it was an integer, if it in fact cared.
Not enough for the 'dataheads'
While XML addresses most of the concerns of the document-using
and managing community quite well (with the exception of support
for overlapping markup), people used to working with databases or
objects just didn't see how this text and structure stuff could possibly
be heavy-duty enough for their applications.
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