[mapguide-users] Re: maestro expression editor syntax

[Jackie Ng]

The grammar for filters is here (BNF notation):
http://www.osgeo.org/files/fdo/docs/FDG_FDODevGuide/files/WS73099cc142f487555e01641096cb1c9da-7c09.htm

A spatial filter is of the form:

<Identifier> <SpatialOperations> <Expression>

<Identifier> is any geometric property in your feature class

<SpatialOperations> is any of the following: CONTAINS | CROSSES | DISJOINT |
EQUALS | INTERSECTS | OVERLAPS | TOUCHES | WITHIN | COVEREDBY | INSIDE

<Expression> is any geometric property or any expression that evaluates to a
geometry, you can use the GeomFromText() expression function to use a
pre-defined geometry (in WKT form)

- Jackie


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