Clarification on unsupported APIs needed

[janwinkler]

A clarification is needed what a CMP should do when receiving a consent string that includes an unsupported section. The CMP might not be able to decode it but is required to encode it (concat it to the full consent string).

Suggested wording:
When a CMP finds a section in a consent string that is encoded in a format that is not supported by the CMP, the CMP is required to store this section. When creating or updating the consent string, the CMP is required to include the original section in the new or updated consent string.