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A WFS GetFeature query looks something like this:

http://hname/arcgis/services/sname/MapServer/WFSServer?SERVICE=WFS&REQUEST=GetFeature&VERSION=1.0.0&MAXFEATURES=1001&FILTER=%3CFilter%3E%3CPropertyIsEqualTo%3E%3CPropertyName%3EADDRKEY%3C/PropertyName%3E%3CLiteral%3E1001%3C/Literal%3E%3C/PropertyIsEqualTo%3E%3C/Filter%3E&TYPENAME=Addresses

But users would want to enter something like "ADDRKEY = 1001" so it becomes necessary to convert the infix expression to a AST and then into a WFS filter.

Are there any reusable solutions for converting an CQL filter into a OGC filter?

  • "A=b" is converted into
  • "<PropertyIsEqualTo><PropertyName>A</PropertyName><Literal>b</Literal></PropertyIsEqualTo>"
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up vote 2 down vote accepted

One approach would be to use the OGC Common Query Language (CQL) to generate your expressions and then use the OpenLayers CQL parser to convert to an OGC Filter. A description of the process can be found here.

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