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XQuery
XQuery is a database language that allows you to extract and manipulate data in XML formats, which is a way to share data on the internet. You can use XQuery to access and retrieve any data source in an XML format. With XQuery, you can generate reports on data within an XML database, search text documents on the web for data and extract data for use online.

OQL
OQL, which stands for Object Query Language, is the standard language for object-oriented databases, which represent data as variables, functions or data structures. These databases are popular with companies that want to store large amounts of complex data. Much like SQL does in relational databases, OQL gives you the option to perform queries and retrieve data in object databases.

LINQ
LINQ, or Language Integrated Query, is a language that extracts and processes data from XML documents, relational databases and other third-party sources. With LINQ, you can access data through various sources without having to use a separate database language for each one. This ensures consistency among queries for objects, relational databases and XML, allowing you to filter, order and group operations.

source - indeed website