TraitMerger

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

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

Requestors that find a Supplier.

Requestors that do not find a Supplier.

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.

Suppliers that are not found by any Requestor.

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.

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.

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.

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.

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.

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.

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.

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.

Note: Not all tools are available in all transformers.