Existing Wording: Definition

The actual data of the attachment - a sequence of bytes. In XML, represented using base64.

Proposed Wording: Definition

The actual data of the attachment. A sequence of bytes, base64 encoded.

Comment:

Why does the description of Attachment.data say "in XML, represented using base64"? Isn't it represented in base 64 in all representations?

Summary:

Clarify expectation to only base64 XML.