The PPM process extractors provide the operations outlined in the following chapters for transformation or modification of attribute types.
For the sake of simplicity, the syntax examples shown for the operation XML element exclusively use constants. However, the valueof and operation elements can also be specified in an operation.
If a value cannot be determined with a transformation rule, the transformation of the attribute type is only canceled if the value not determined is essential for the subsequent transformation. Depending on what is specified for the onfailure option, a corresponding message may be output in this case.
The return value of the operations is generally an alphanumeric string.