Syntax

   FACTORY_DEF <ReaderKeyword> AttributeFilterFactory
   [FACTORY_NAME <factory name>]
   [INPUT FEATURE_TYPE <factory type>
      [<attribute name> <attribute value>]*
      [<feature function>]*]
   [FILTER_ATTRIBUTE <attribute name>]
   [FILTER_VALUES [<value>]+]
   [OUTPUT <output port> FEATURE_TYPE <feature type>
      [<attribute name> <attribute value>]*
      [<feature function>]*]*

Overview

   Routes features to different output ports depending on the value of an attribute.

Parameters

   FILTER_ATTRIBUTE

      The attribute whose value will be used to filter features.

   FILTER_VALUES

      A space-delimited list of possible attribute values.
      Each value specified in this list will have a corresponding output port.

      There are a few special values that may be used in this list:
      
         <EMPTY> - Filters features whose attribute value is the empty string.
         <MISSING> - Filters features that do not have the specified attribute.
         <NULL> - Filters features whose attribute value is null.
         <UNFILTERED> - Filters features that did not match any of the other
                        specified values.