Typical Uses
- Cleaning up features with small numbers of unnecessary attribute
- Improving performance by removing unneeded attributes
How does it work?
Once connected to input features, the AttributeRemover provides pick lists (one for attributes and one for list attributes) for you to choose which specific attributes to remove. All other attributes are kept, and the modified features are output.
Example: Removing a small number of selected attributes
In this example, several attributes are selected from the pick list for removal.
The Attributes to Remove parameter is populated with those choices.
As the features exit the transformer, the selected attributes have been removed:
Usage Notes
- Consider using the AttributeManager instead
- Use the BulkAttributeRemover to remove all attributes that match a pattern.
- Use the AttributeKeeper to keep selected individual attributes on a feature.
- Removing attributes can improve Workbench performance, making translations run more efficiently and the Workbench interface respond more quickly.
Configuration
Input Ports
Input
The feature type that contains the attributes you want to remove.
Output Ports
Output
All features are output through this port, with the selected attributes removed.
Parameters
Attributes to Remove
Click the browse button to display the list dialog. Select the attributes that you want to remove from the feature. The unchecked attributes will be retained.
Lists to Remove
After you connect this transformer, click the Browse button and select the lists to remove.
Note that if you select to remove a list, your selection will include any list attributes or nested lists. For example, if you select to remove a list called
list{}
then list{}.attr or list{}.sublist{}
will also be removed.
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.
How to Set Parameter Values
Using the Text Editor
The Text Editor provides a convenient way to construct text strings (including regular expressions) from various data sources, such as attributes, parameters, and constants, where the result is used directly inside a parameter.
Using the Arithmetic Editor
The Arithmetic Editor provides a convenient way to construct math expressions from various data sources, such as attributes, parameters, and feature functions, where the result is used directly inside a parameter.
Conditional Values
Set values depending on one or more test conditions that either pass or fail.
Parameter Condition Definition Dialog
Content
Expressions and strings can include a number of functions, characters, parameters, and more - whether entered directly in a parameter or constructed using one of the editors.
Content Types
| These functions manipulate and format strings. | |
| A set of control characters is available in the Text Editor. | |
| Math functions are available in both editors. | |
| These operators are available in the Arithmetic Editor. | |
| These return primarily feature-specific values. | |
| FME and workspace-specific parameters may be used. | |
| Working with User Parameters | Create your own editable parameters. |
Reference
|
Processing Behavior |
|
|
Feature Holding |
No |
| Dependencies | None |
| FME Licensing Level | FME Base Edition and above |
| Aliases | ListRemover |
| History | |
| Categories |
FME Knowledge Center
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Examples may contain information licensed under the Open Government Licence – Vancouver