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

Output Ports

Parameters

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 if you want to isolate only a portion of the geometry passed in to the transformer. If no criteria are specified, the action will apply to the entire geometry at all levels. Selection can be based on structural location, geometry name, 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 name 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 if you want to isolate only a portion of the geometry passed in to the transformer. If no criteria are specified, the action will apply to the entire geometry at all levels. Selection can be based on structural location, geometry name, 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 name 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

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.

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

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

Table Tools

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.

FME Community

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Keywords: concatenated foreign key tag cross-reference "cross reference" TraitMerger