Quote:
What is XML?
XML is a markup language for documents containing structured information.
Structured information contains both content (words, pictures, etc.) and some indication of what role that content plays (for example, content in a section heading has a different meaning from content in a footnote, which means something different than content in a figure caption or content in a database table, etc.). Almost all documents have some structure.
A markup language is a mechanism to identify structures in a document. The XML specification defines a standard way to add markup to documents.
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I always think of it as a universal settings document, it stores how a certain code structure works, what's useful about it is it stores certain tags so it can be applied to a general set of codes to make them work in a particular way.
(Hope that makes sense)