An array of bytes MAY be encoded as a single-reference or a
multi-reference value. The rules for an array of bytes are similar to
those for a string.
In particular, the containing element of the array of bytes value MAY
have an "id" attribute. Additional accessor elements MAY then have
matching "href" attributes.
The recommended representation of an opaque array of bytes is the
'base64' encoding defined in XML Schemas , which uses the
base64 encoding algorithm defined in 2045 . However, the line
length restrictions that normally apply to base64 data in MIME do not
apply in SOAP. A "SOAP-ENC:base64" subtype is supplied for use with