Calculates a UUID (Universally Unique IDentifier) or ULID (Universally Unique Lexicographically Sortable Identifier) for each incoming feature, and adds it as an attribute.

UUIDs are expressed as a string consisting of 8 hexadecimal digits, followed by a hyphen, then three groups of 4 hexadecimal digits, each followed by a hyphen, then 12 hexadecimal digits. It is 36 bytes in size. UUIDs look like:


UUIDs may be optionally output with curly braces (GUIDs).

ULIDs are expressed as a string consisting of 26 characters. For more information, see Universally Unique Lexicographically Sortable Identifier. Note that FME does not use a “cryptographically secure” source of randomness for ULIDs and thus the output may not be appropriate for some purposes.

This transformer is similar to the GOIDGenerator, which generates a unique ID for each feature partially based on that feature's geometry.



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.

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