in with


CQL stands for Contextual Query Language. The main purpose of CQL is to represent queries to information retrieval systems. In fact, CQL is commonly used together with the Search Retrieve URL (SRU) protocol to represent URL-friendly search queries.

In KorAP, we support basic CQL as defined in the CLARIN Federated Content Search (FCS) specification for basic search. KorAP does not support other operators and modifiers than AND and OR, such as REL and PROX.


Querying a simple term


Querying a phrase

"Öl ins Feuer"

Boolean queries

giessen OR gießen
Feuer and gießen


searchRetrieve: Part 5. CQL: The Contextual Query Language version 1.0, OASIS, January 2013