GeoServer supported filter languages¶

Data filtering in GeoServer is based on the concepts found in the OGC Filter Encoding Specification, which we suggest the reader to get familiar with.

In particular GeoServer accepts filters encoded in three different languages:

• OGC Filter encoding specification v 1.0, used in WFS 1.0 and SLD 1.0
• OGC Filter encoding specification v 1.1, used in WFS 1.1
• CQL, Catalog Query Language, a plain text language created for the OGC Catalog specification and adapted to be a general and easy to use filtering mechanism.
• ECQL, Extended CQL, an extension to CQL that allows to express the same filters OGC Filter 1.1 can encode. A quick CQL and ECQL is also available in this guide that shows examples of both CQL and ECQL.

We suggest to look into the respective specifications for details.