Serialization recommendation for booleans?

[gpdf]

I find the stereotyped paragraphs about VOTable serialization at the end of almost every subsection of Section 3 very useful. For example:

Floating point interval values serialised in VOTable or service parameters must have the following metadata in the FIELD element: datatype="double" or datatype="float", arraysize="2", xtype="interval".

I recommend adding the same kind of statement in Section 3.2, Boolean.