Why XML to comunicate Distributed Components?

Well, the purposing of this post is to find good reason about xml
technology as message format.
My question is: Why the communication between components should be
XML?

XML has some features as self-described, human-readable, etc..., and
there are many tools for validation and parsing.
Those features are very useful for Configuration files and
Descriptions file which could be edited by humans.
But, Are those features necessaries to communicate two components? Is
it necessary that communication between two component being human-
readable?
About self-described:
Self-described messages is useful for computing, I mean, validations,
infering, etc... But, Is it necessary the message in Plain Text
format?.
Which are the benefit of use XML to communicate components?
.

Relevant Pages

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