Prefixing and Appending Transformations

In addition to producing new transformations by concatenating existing ones, it is also possible to modify an existing transformation by prefixing or appending another one to it. For example, to prefix one transformation to another, TRN_PRFX (prefix transformation) would be used, thus:

CALL TRN_PRFX( LOCTR1, LOCTR2, STATUS )

In this case, the two transformations with locators LOCTR1 and LOCTR2 are concatenated (as above), but the resultant transformation replaces the second one, so that the first transformation is, in effect, prefixed to it. The first transformation itself is not altered.

The routine TRN_APND (append transformation) behaves in a similar way, except that it appends the second transformation to the first. In this case the second transformation remains unchanged.