[xcbf] SignedData Attributes - DigitalSignature Attributes

[Phil Griffin <phil.griffin@asn-1.com>]

I proposed on 8/6 that the following XML markup be used
in XCBF.

    <version> ........................ </version>
    <digestAlgorithms> ............... </digestAlgorithms>
    <encapContentInfo> ............... </encapContentInfo>
    <certificates format='base64'> ... </certificates>
    <crls format='base64'> ........... </crls>
    <signerInfos> .................... </signerInfos>

The signature component of the SIGNATURE parameterized
type identifies a value of type BIT STRING. These bits
are not used as bit flags, and signatures tend to be in
the thousands of bits in length and can more easily and
compactly be represented as OCTET STRINGs. I propose that
the following XML markup be used for these values:

    <signature format='hex'> ... </signature>

So far, I have received no comments. Unless I hear comments
that use of these attributes is unacceptable, I will include
them in the next release of the XCBF document.

Phil