FQL enables you to use a SQL-style interface to query the data exposed by the Graph API.
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All these tasks can be formulated as queries in an object-oriented query language named .QL.
Chess Query Language, a query language for interrogating chess databases;
Contextual Query Language (or common query language), a formal language for information retrieval.
The search engine uses a query language similar to PubMed.
This is an abstract query language (like SQL and XQuery) that is independent from any other OGC service standard.