You can configure a component to output failure events to a user-defined log. For example, if an anchor fails to find text in the source document, it can write a message in the user log. This can occur even if the anchor is defined as optional, so that the failure does not terminate the transformation processing.
The user log can contain information such as:
Failure level: Information, Warning, or Error
Name of the component that failed
Location of the failed component in the Script
Additional information about the transformation status, such as the values of data holders.