You do not need to set both FILTERITEM and FILTER. You can just set
FILTER to an expression using as many attributes as you need. e.g.
FILTER (( [POPULATION] < 500000 ) AND ("[DISPLAY]" == "1")). Just like
you can have multiple attributes in a class EXPRESSION.
I think it's the section of the document that is key - the "MapServer
Expressions" section talks about using FILTER and EXPRESSION in more
complex logical expressions, where as the section you quoted is talking
about basic string comparison.
Christy
On 14/05/14 08:03 AM, Rahkonen Jukka (Tike) wrote:
Hi,
From document page: http://mapserver.org/mapfile/expressions.html
"To use a string comparison for filtering a LAYER, both FILTERITEM and FILTER must
be set. FILTERITEM is set to the attribute name. FILTER is set to the value for
comparison. The same rule applies to CLASSITEM in the LAYER object and EXPRESSION in the
CLASS object."
That would mean that only one attribute from the data can be used for building
a filter. Is this true or just old information living in the document?
-Jukka Rahkonen-
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