[dcl.attr.grammar]/8 Lacking *Recommended practice* for *attribute-namespace*s

[BlowingWind314]

[dcl.attr.grammar]/8 includes some recommendation:

... Each implementation should choose a distinctive name for the attribute-namespace in an attribute-scoped-token.

But there is no Recommended pratice for it.

[jensmaurer]

Yup, that sentence predates the habit. Patch welcome.