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Subject: Re: [ubl] Extension element children
I am not sure whether you are talking ASN.1 or something else.
But for ASN.1, the extension marker can appear anywhere in a SEQUENCE etc, but
if it is in the middle, the syntax is (eg):
Fred ::= SEQUENCE {
first First,
second Second,
...,
...,
third Third,
fourth Fourth}
The next version puts additional elements between the two extension markers.
Please note (you probably already know) that if you want backwards
compatability, the extension markers have to be present in "version 1", and you
cannot move them in "version 2".
John L
Stephen Green wrote:
> Is there any reason why the extension * has * to be at the end of
> the document? The reason I ask is that there may, if so, be an issue
> with further extending the document with minor versions within UBL,
> mightn't there? Such extensions would * have * to be at the end of
> the document - for backwards compatibility. They would therefore
> replace the extension element as the last element in the document.
> I'm hoping the extension element is only placed at the end of the
> document for aesthetic or common practise reasons.
>
> All the best
>
> Steve
>
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--
Prof John Larmouth
Larmouth T&PDS Ltd
(Training and Protocol Development Services Ltd)
1 Blueberry Road
Bowdon j.larmouth@salford.ac.uk
Cheshire WA14 3LS
England
Tel: +44 161 928 1605 Fax: +44 161 928 8069
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