Bug in xmlattributes() ?

[Vectorspace]

With xmlelement() and xmlforest(), if the tag value is a string literal, it is included as-is

But with xmlattributes(), if the attribute value is a string literal, it is base64 encoded

Is this correct? I would expect xmlattributes() to behave just like xmlelement() and xmlforest(), and do a base64 encode only if the value has ccsid 65535 (bit data)

[Vectorspace]

Okay now I think it might be something else, because for some programs it's also happening for xmlelement() and xmlforest() values
ProgramA, compiled from source in LibraryA/QRPGLESRC, string literals for xmlelement() are normal
ProgramB, compiled from source in LibraryB/QRPGLESRC, string literals for xmlelement() are base64 encoded

The only thing I can think of is that LibraryA/QRPGLESRC has CCSID 285, and LibraryB/QRPGLESRC has CCSID 65535. So I guess for string literals, the SQL functions use the CCSID of the source file?