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5.6.1.1 Keywords and column names

  In keywords and table column names, HEASARC recommends use of the underscore (hexadecimal 5F) rather than the hyphen (hexadecimal 2D). The only cases where a hyphen is to be used in keywords are

This set of recommendations is similar to those in the original paper for ASCII table fields, as discussed in section 3.4.2, but extends them to keywords and binary table fields. Extending the rules for keywords to column names makes it possible to replace a table column heading with a keyword with the same name if the value for that column in every row of the table is the same, as in the Green Bank convention (section 5.2.3.2).

HEASARC/OGIP requires the following additional conventions for column names in all tables it produces and recommends them for others:


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