Other document reference properties for sizing

["G. Ken Holman" <gkholman@CraneSoftwrights.com>]

Another discussion item was the possibility to add to DocumentReference:

http://docs.oasis-open.org/ubl/os-UBL-2.1/mod/summary/reports/UBL-AllDocuments-2.1.html#Table_DocumentReference.Details

   DocumentSizeNumeric 0..1 Numeric The size of the original form of the
                                    file in bytes.

... and to add to Attachment:

http://docs.oasis-open.org/ubl/os-UBL-2.1/mod/summary/reports/UBL-AllDocuments-2.1.html#Table_Attachment.Details

   AttachmentSizeNumeric 0..1 Numeric The size of the attachment in bytes.

When the attachment embeds or points to the document in the clear, 
the two size values are the same.  When the attachment embeds or 
points to the document encoded using a particular syntax, the two 
size values are different.

While being informational for some users, this is also a first-level 
integrity check:  before attempting to decode an attachment, one 
could first check that the attachment has the correct size (no use 
continuing if it isn't), and before checking the document hash of the 
document in the clear, one could first check that the document has 
the correct size (no use continuing if it isn't).

Should these be added?

. . . . . . . Ken

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