Does ‘markup in non-understood namespaces’ refer to markup definitions in namespaces met while validating parsers read namespace definitions, or else to markup which elements, attributes, entities, etc. are defined by specific namespaces, deemed as ‘non-understood’ by the specification

Clarify.

page 10, line 24 Part 5, Section 8.2 Markup Compatibility Namespace

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Proposed Disposition of DIS 29500 Comment FR-0563 (Modified: 2008-01-02) Agreed; the text “markup in non-understood namespaces” refers to elements and attributes drawn from non-understood namespaces. The following clarification will be made to Part 5, §8.2, page 10, line 24: The namespace includes XML elements and attributes that markup producers can use to express to markup consumers how they shall respond to markup elements and attributes encountered that belong to in non-understood namespaces.