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Subject: Re: ASN-1 - XCBF Liaison?


This would be great stuff for an annex in version two, which
I hope to put underway shortly. If we had words like these and
a simple table of the controls and a brief defintion of what they
do and a pointer to the standard, we could reference this from
the body of the document where we need Base64 encoded

But such an annex whould help to hook XCBF up better to
XSD based tools. It could provide greater flexibility for
applications developers.

Want to write this? You can protect your rights as owner of
your words as I have. Before I place anything is any standard
anymore, I first post the words on a web page somewhere on
my web site.

This is how I shared my writing between XCBF and X9.84. I
first put it on my web page, then paraphrased my own words
as I drafted text for these documents. I figure that each body
owns their version of the words and I still own mine as well.

For schema notation this approach was critical, as I could
not allow the schemas in the two documents to vary. They
had to be the same for them to interwork, but each standards
body had to have their own copyright. I got the idea from
our friend Richard, who spoke at length on copyright law to
the MoU Management Group, and privately in a subsequent
string of emails.

As if doing this technical work itself weren't hard enough.


John Larmouth wrote:

> Phillip H. Griffin wrote:
>> John,
>> I do not have a clue what you mean when you use the term
>> "EXTENDED-XER". I can find no mention of this term in
>> any of the ASN.1 standards that XCBF and X9.84 reference.
> EXTENDED-XER is what was earlier referred to as VXER (Variant XER). 
> That is just a name change.  Use of it allows encoding instructions to 
> be applied (without an encoding instruction it does not differ from 
> BASIC-XER - the new name for what you would call XER).  A single 
> encoding instruction can modify many of the XER encodings to use text 
> rather than empty element tags, to provide better alignment with XSD 
> encodings.  There are also about 20 specific encoding instructions 
> such as BASE64 that perform specific functions in relation to XML 
> encodings.
> Probably the most important such encoding instruction is UNTAGGED, 
> that removes XML tags round things like a sequence of elements, or a 
> choice of alternatives, or a sequence of elements, but there are 
> others that are designed to support XSD-specific functionality, such 
> but not exclusively, the encoding instructions have been developed to 
> support the mapping from XSD, and apart from BASE64, are probably not 
> of particular relevance to the XCBF work.
> John L

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