Serialization question

Dear,

While preparing my answer to my action on serialization, I find this
point in 5.6 p:serialization

[[
 The default value of any unspecified serialization option is
implementation-defined.

]]

I fear this goes against

[[
err:XS0008

    It is a static error if any element in the XProc namespace has
attributes not defined by this specification unless they are extension
attributes.

    See: Syntax Summaries
]]

Mohamed

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