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The extra information provided by the use of the specific LIKE or LIKEDS keyword would be useful for programmers using those fields, although for variable definitions, that extra information is also provided by either "DCL-S" or "DCL-DS". However for parameter definitions, the difference between LIKE and LIKEDS is crucial for any programmer working with the procedure.
-IBM Power Systems Development
In fact, the LIKEDS keyword is a bit redundant:
It's clear that the definition should create a data structure, due to the dcl-ds statement - so it's also clear, that a like(...) would reference to another data structure.
But I don't think, that a combination of type keyword and like keyword would be good. It should be clear, that the definition it either "original" or "based on another".