DDSXTY12 — Extended parameters should be aligned the same as non-extended ones

Found by: Fernando Crespo, RTI (fernando@rti.com)
Severity: Support Text

Problem:
The section on the parameterized CDR Data Representation (DDS-XTypes 7.4.1.2) contains a reference to the DDS-RTPS specification for the definition of the parameter list data structure. However, it does not specifically refer to the instructions in DDS-RTPS on how to handle alignment within such a structure. This omission may confuse some implementers, especially with respect to extended parameters, which should follow the same alignment rules as RTPS-traditional "short" parameters.

Proposed Resolution:
Add the following paragraph to the end of section 7.4.1.2.1, "Interpretation of Parameter ID Values":

"The alignment rules for extended parameters shall be the same as
those for non-extended parameters, which are defined in [RTPS]
Section 9.4.2.11."

Specify alignment of Extended Parameters

Accept the suggestion from the issue description.