Xml databases are used for handling the xml files / documents with ease. That is the reason for which they are built from ground up. There are lots of tutorials available in the internet for xml databases.

Since there are many xml databases available in the market you have to look for a tutorial on using a particular type of xml database. You should look for the steps on how to use XQuery and XPath in them.

They should provide you with detailed examples on how to use them. Some of them should also provide you an interface to check out those queries on a particular database while you learn.

Learning how to use XPath in an XQuery to perform advanced queries should also be available. A brief introduction to using regular expressions would also help you to perform well.

An introduction to XSLT would also help you to transform the xml documents into other forms of output for the user. Some of them also provide you support for using APIs' meant for developing application using a particular language. So you can also look for ways to learn how to use those APIs' to work with your xml database.

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