XML and its use in Databases

What is XML and how is it used in databases? If it looks like homework, it is.

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Databases are often used to store XML blocks for applications that do not want to serialize them into a real database schema. But generally speaking, XML is not used in databases.

This implies that databases store data, where XML does pass it agnostically.

(Simplified) It usually happens that application A converts data from database A to an XML stream that is passed to application B. Then application B converts XML into a series of SQL statements that create records in database B.

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