This transformer can be useful when dealing with transformers, such as the SchemaMapper, that dynamically add attributes onto features.
It is also useful if you know that features have hidden attributes (FME Attributes and the more obscure Format Attributes) that aren't shown in Workbench. You can use the AttributeExposer to "expose" these attributes.
This transformer is a more dynamic version of the Expose Attributes option in the context-menu of an input feature type.
Once the attributes are exposed, they can be used by other transformers.
The input features are not modified in any way.
Input Ports
Input
Features with attributes.
Output Ports
Output
Features with exposed attributes.
Parameters
Attributes to Expose
After you place the transformer, you can type attribute names or choose them from the drop-down list. The order in which they appear in the list is the order in which they will appear in the Output port of the transformer.
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
Search FME Knowledge Center
Search for samples and information about this transformer on the FME Knowledge Center.