Public Comment

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Comment from: rak@itst.dk

A few general questions regarding UBL and XSD.

1.	In the UBL guideline document is an example (in section 3.1.2 Restrictions) on how to eliminate optional elements:
“you can eliminate an optional element (that is, change its cardinality from 0..3 to 0..0)”.
I just wan’t to make shure this doesn’t mean that you have to write maxoccures=”0” but just omit writing the element in your restriction.

2.	The UBL guideline document prmarily talks about modeling the types in UBL. I have some doubt on what is allowed on element level – and still be UBL-Compatible.   
a.	Is it aloved to create new elements if these are based on UBL types (under a new namespace ofcourse) 
b.	Is it allowed to create elements based on my own types?

3.	Is it allowed to restrict-extend? Ex.: I want to remove an optional element and extend the schema with another UBL element. This requires two steps in xml-schema – is there any recommendations on how to du this? 
The way I do it now is by restricting to an abstract type (like a temp. value) and then extending this to the desired result. Is this UBL-Compliant?

4.	There are some guidelines on how to model the file structure of UBL. I would like to “atomize” the schemas so that there is one element pr. file. Is this Compliant? It is has no infuence on the structure of the toplevel schemas..

Regards
Rasmus