TraitMerger

Moves the traits from one geometry onto another geometry. It can also move the attributes from a feature onto a geometry as traits, or the traits from a geometry onto a feature as attributes.

The TraitMerger does not support attribute-attribute merges. For merging attributes between features, use the FeatureMerger.

Features that contain the desired attributes/traits are connected through the Supplier port, and the features that will receive the attributes/traits are connected through the Requestor port.

Requestor features/geometry are joined to Supplier features/geometry when the expressions specified in the Join On parameter ALL have the same value for both the requestor and supplier.

Configuration

Input Ports

Requestor

Receives the new attributes/traits from the features connected to the Supplier port.

Supplier

The source of new attributes/traits for features that enter through the Requestor port.

Output Ports

Merged

Requestors that find a Supplier.

UnmergedRequestor

Requestors that do not find a Supplier.

UsedSupplier

Suppliers that are found by at least one Requestor.

Note A Supplier may still be output through this port even though none of its attributes/traits were merged. This can occur because all of the attributes/traits were already present in the Requestor.

UnusedSupplier

Suppliers that are not found by any Requestor.

Parameters

Join On

Specify an expression from the Requestor to match with the Supplier expression. An expression can be a constant, attribute value, trait value, function or mixture. Matches are made when the values of all the Requestor expressions equal the values of their corresponding Supplier expressions.

Merge

Requestor Type	This parameter specifies the requestor type: When the Requestor Type parameter is Trait, the geometries chosen under Requestor Geometry Part Selection will be used as requestors. In this mode trait values can be used in the Requestor Join On expression column. If Supplier Type is Attribute, supplier attributes will be transferred to the requestor as traits. If Supplier Type is Trait, supplier traits will be transferred to the requestor directly. When the Requestor Type parameter is Attribute, incoming features will be used as requestors. In this mode attribute values can be used in the Requestor Join On expression column. If Supplier Type is Trait, supplier traits will be transferred to the requestor as attributes.
Requestor Geometry Part Selection	When Requestor Type is set to Trait, this parameter controls which portions of the geometry are used as requestors. Use this parameter to isolate only a portion of the input geometry. If no criteria are specified, the action will apply to the entire geometry at all levels. Selection can be based on structural location, geometry label, type, appearance information, traits, trait storage types, or definition reference. The syntax used is a restricted set of XQuery, where the return clause is fixed. The basic Geometry XQuery dialog allows you to construct simple selection queries by automatically writing the necessary query based on specified test clauses. Clicking the Switch to Advanced button opens the Advanced Editor, which allows you to type a query free-form, for more expressive queries. Note Once you switch to Advanced mode, you will have to clear all parameters before you can return to Basic mode. A hierarchical geometry is represented as nodes of type geometry, with attributes containing information about traits, type, and label for each geometry.
Supplier Type	This parameter specifies the supplier type: When the Supplier Type parameter is Trait, the geometries chosen under Supplier Geometry Part Selection will be used as suppliers. In this mode trait values can be used in the Supplier Join On expression column. Requestors will receive traits from their matched supplier geometry. When the Supplier Type parameter is Attribute, incoming features will be used as suppliers. In this mode attribute values can be used in the Supplier Join On expression column. Requestors will receive attributes from their matched supplier feature.
Supplier Geometry Part Selection	When Supplier Type is set to Trait, this parameter controls which portions of the geometry are used as suppliers. Use this parameter to isolate only a portion of the input geometry. If no criteria are specified, the action will apply to the entire geometry at all levels. Selection can be based on structural location, geometry label, type, appearance information, traits, trait storage types, or definition reference. The syntax used is a restricted set of XQuery, where the return clause is fixed. The basic Geometry XQuery dialog allows you to construct simple selection queries by automatically writing the necessary query based on specified test clauses. Clicking the Switch to Advanced button opens the Advanced Editor, which allows you to type a query free-form, for more expressive queries. Note Once you switch to Advanced mode, you will have to clear all parameters before you can return to Basic mode. A hierarchical geometry is represented as nodes of type geometry, with attributes containing information about traits, type, and label for each geometry.

Attribute/Trait Accumulation

If attributes/traits on the supplier and requestor feature share the same name, but are not geometry attributes that start with fme_, then they are deemed conflicted.

Accumulation Mode

Merge Supplier: The requestor feature/geometry will retain all of its own un-conflicted attributes/traits, and will additionally acquire any un-conflicted attributes/traits that the supplier feature/geometry has. This mode will handle conflicted attributes/traits based on the Conflict Resolution parameter.

Only Use Supplier: The requestor feature/geometry will have all of its attributes/traits removed, except geometry attributes that start with fme_. Then, all of the attributes/traits from one (arbitrary) supplier feature/geometry will be placed onto the requestor.

Conflict Resolution

Use Requestor: If a conflict occurs, the requestor values will be maintained.

Use Supplier: If a conflict occurs, the values of the supplier will be transferred onto the requestor.

Editing Transformer Parameters

Transformer parameters can be set by directly entering values, using expressions, or referencing other elements in the workspace such as attribute values or user parameters. Various editors and context menus are available to assist. To see what is available, click beside the applicable parameter.

How to Set Parameter Values

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.

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.

Text Editor

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.

Arithmetic Editor

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.

When setting values - whether entered directly in a parameter or constructed using one of the editors - strings and expressions containing String, Math, Date/Time or FME Feature Functions will have those functions evaluated. Therefore, the names of these functions (in the form @<function_name>) should not be used as literal string values.

Content Types

String Functions	These functions manipulate and format strings.
Special Characters	A set of control characters is available in the Text Editor.
Math Functions	Math functions are available in both editors.
Date/Time Functions	Date and time functions are available in the Text Editor.
Math Operators	These operators are available in the Arithmetic Editor.
FME Feature Functions	These return primarily feature-specific values.
FME Parameters	FME and workspace-specific parameters may be used.
Creating and Modifying User Parameters	Create your own editable parameters.

Dialog Options - Tables

Table Tools

Transformers with table-style parameters have additional tools for populating and manipulating values.

Row Reordering

Enabled once you have clicked on a row item. Choices include:

Add a row
Remove a row
Move current row up one
Move current row down one
Move current row to top
Move current row to bottom

Cut, Copy, and Paste

Enabled once you have clicked on a row item. Choices include:

Cut a row - delete and copy to clipboard
Copy a row to the clipboard
Paste a row from the clipboard

Cut, copy, and paste may be used within a transformer, or between transformers.

Filter

Start typing a string, and the matrix will only display rows matching those characters. Searches all columns. This only affects the display of attributes within the transformer - it does not alter which attributes are output.

Import

Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers.

Reset/Refresh

Generally resets the table to its initial state, and may provide additional options to remove invalid entries. Behavior varies between transformers.

Note: Not all tools are available in all transformers.

For more information, see Transformer Parameter Menu Options.

Reference

Processing Behavior	Feature-Based
Feature Holding	Yes
Dependencies	None
Aliases
History

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