Output Ports
One feature is output for each unique combination of values of the attributes specified in the Group By parameter. Features output from this transformer have no geometry.
Parameters
Transformer
Group By
This parameter allows you to specify the attribute values on which to join the series of input features. One feature is output for each group created by selecting a Group By attribute. If no Group By attributes are specified, then a single feature is output and the number of elements in its list is equivalent to the number of features input into the ListBuilder.
Parameters
List Name
The features output from the ListBuilder have all of their attributes stored in the list identified by the name specified by this parameter.
Add To List
All Attributes: Every attribute from all input features that created an output feature will be added to the list specified in List Name.
Selected Attributes: Only the attributes specified in the Selected Attributes parameter will be added to the list specified in List Name.
Selected Attributes
The attributes to be added to the list when Add To List is Selected Attributes.
Input Ordered
No: This is the default behavior. Processing will only occur in this transformer once all input is present.
By Group: This transformer will process input groups in order. Changes on the value of the Group By parameter on the input stream will trigger batch processing on the currently accumulating group. This will improve overall speed if groups are large/complex, but could cause undesired behavior if input groups are not truly ordered.
Example
Suppose this transformer is used with no group-by attributes, and three features enter it with these attributes:
|
Feature 0: |
length = 7.3 kind = 'paved' |
|
Feature 1: |
length = 8.4 kind = ’smooth’ lanes = 2 |
|
Feature 2: |
length = 1.1 kind = ’rough’ |
then, presuming that the list name specified was somelist, a single feature with these attributes is output:
somelist{0}.length = 7.3
somelist{0}.kind = ’paved’
somelist{1}.length = 8.4
somelist{1}.kind = ’smooth’
somelist{1}.lanes = 2
somelist{2}.length = 1.1
somelist{2}.kind = ’rough’
Editing Transformer Parameters
Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click 
beside the applicable parameter. For more information, see Transformer Parameter Menu Options.
Transformer Categories
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