[OT] Re: Validation of XML Schema (XSD) element groups

/Andrew Paterson/:

> Note: I came to XML from EDI where mandatory composites with all 
> elements optional are fairly common and have the obvious meaning.
> I must say that I am glad that there are only two elements in the group 
> - if there were a lot of elements, it would require a long and 
> complicated "choice" structure to represent it!
I guess the thing is EDIFACT format is different than XML in means 
one can't have next sibling element (subsegment or field) without 
having a previous sibling, like in CSV document one can't define 3rd 
column without explicitly having a second one:
value1,,value3

May be the XML Schema could be extended to define such model, but 
don't expect that to happen soon.
--
Stanimir