AttributeExposer
Typical Uses
- Exposing attributes that a workspace is not aware of, such as those created by a SchemaMapper
- Exposing normally unexposed fme_ and format-specific attributes for use in the workspace
- Exposing attributes in a dynamic translation where source attributes may vary
How does it work?
The AttributeExposer makes unexposed attributes visible in Workbench so they can be used elsewhere in the workspace. This transformer is useful if you know features have an attribute, but that attribute is not currently showing as available in your workspace. For example:
- FME Attributes (fme_) and more obscure format-specific attributes that are not automatically shown in Workbench.
- Transformers, such as the SchemaMapper, that dynamically add attributes onto features which Workbench is not aware of.
You may enter the attribute names manually, or import attributes from any supported source dataset. Known attributes (including fme_ and format-specific attributes that are not currently exposed) can be selected from the drop-down menu.
This transformer only exposes the attribute in Workbench - it does not ensure that valid attribute names are being exposed. The input features are not modified in any way.
Once the attributes are exposed, they can be accessed elsewhere in the workspace.
Cached Values and Data-Aware Attribute Names
If Feature Caching is enabled, valid attribute names from upstream features are shown for attribute selection.
Examples
Usage Notes
- Expose attributes fme_basename and fme_dataset in the reader feature type or the FeatureReader transformer. These attributes are not read unless they are exposed in this manner.
Configuration
Input Ports
Output Ports
Parameters
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.
Defining Values
There are several ways to define a value for use in a Transformer. The simplest is to simply type in a value or string, which can include functions of various types such as attribute references, math and string functions, and workspace parameters. There are a number of tools and shortcuts that can assist in constructing values, generally available from the drop-down context menu adjacent to the value field.
Dialog Options - Tables
Transformers with table-style parameters have additional tools for populating and manipulating values.
Reference
Processing Behavior |
|
Feature Holding |
No |
Dependencies | None |
FME Licensing Level | FME Base Edition and above |
Aliases | |
History |
FME Community
The FME Community is the place for demos, how-tos, articles, FAQs, and more. Get answers to your questions, learn from other users, and suggest, vote, and comment on new features.
Search for all results about the AttributeExposer on the FME Community.
Examples may contain information licensed under the Open Government Licence – Vancouver and/or the Open Government Licence – Canada.