Answer Posted / g.h
XML stands for "eXtensible Markup Language".
In reality, this is a slight misnomer. XML is not really a
language. Rather, it is a meta-language, used to describe
the syntax rules for an infinite amount of possible
languages implementing XML. Or, it could be regarded as a
set of standards that define what a markup language must do
to be XML-compliant.
For example, HTML is a markup language. It has a
well-defined application domain, every markup tag has a
specific meaning and it can be used by applications to
present some result. However, it is not an XML implementation.
XHTML is a variation on HTML that is made XML-compliant. It
still has the same meaning as HTML and is a specific markup
language, only now can be seen as an XML implementation.
XML itself is not truly a language like HTML or XHTML. It
does not define any tags or semantics itself. It only
provides a set of syntax rules that can be used to implement
markup languages.
The "extensible" part of the name indicates that an XML
implementation can be extended at will. New tag names may be
defined for any XML language and with some care this can
even be done without breaking backwards compatibility.
The "markup" part indicates XML concerns itself with markup,
to bring structure to information.
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