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A selector function is a PL/SQL procedure that automatically identifies the specific process definition to execute when a workflow is initiated for a
particular item type but no process name is provided. Oracle Workflow also supports using a callback function to reset or test item type context information. You can define one PL/SQL procedure that includes both selector and callback functionality by following a standard API.
Oracle Workflow can call the selector/callback function with the following commands:
RUN - to select the appropriate process to start when a process is not mentioned.
SET_CTX - to establish any context information for an item type and item key
combination that a function activity in the item type needs in order to execute.
TEST_CTX - to determine if the current item type context information is correct
before executing a function, such as during background processing.
Please check the Workflow Dev Guide for more information on the Standard API for a Selector Function.