Workbench supports two types of attributes:
User attributes can have their names and data types adjusted to meet the needs of the user. They correspond to the columns in any attribute tables created during the translation.
Format attributes are fixed by FME. Descriptions of the attributes available for each reader (input format) and writer (output format) are given in the FME Readers and Writers manual, available in the download section of our website. Format attributes can be exposed in a workspace so that they can be set to particular values.