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In a CSW request what is the difference between the parameters CQL_FILTER and FILTER ?

Examples: 

localhost:8080/geonetwork/srv/eng/csw?REQUEST=GetRecords&CONSTRAINT_LANGUAGE_VERSION=1.1.0&RESULTTYPE=results&VERSION=2.0.2&TYPENAMES=gmd%3AMD_Metadata&CONSTRAINTLANGUAGE=CQL_TEXT&SERVICE=CSW&CONSTRAINT=Product

and

localhost:8080/geonetwork/srv/eng/csw?REQUEST=GetRecords&CONSTRAINT_LANGUAGE_VERSION=1.1.0&RESULTTYPE=results&VERSION=2.0.2&TYPENAMES=gmd%3AMD_Metadata&CONSTRAINTLANGUAGE=FILTER&SERVICE=CSW&CONSTRAINT=Product

Is there any CQL documentation?

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CQL (Common Query Language) is a query language created by the OGC for the Catalogue Web Services specification. Unlike the XML-based Filter Encoding language, CQL is written using a familiar text-based syntax. It is thus more readable and better-suited for manual authoring.

Filter is (usually) an OGC filter which is expressed in XML and is more suited for machines to write.

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  • It should also be noted that these parameters are optional and vendor specific, and can vary.
    – Barbarossa
    Commented Apr 18, 2017 at 16:00
  • not in the CSW spec they aren't optional or vendor specific
    – Ian Turton
    Commented Apr 18, 2017 at 16:07

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