[Nml-wg] XML syntax for NML relations

[Jeroen van der Ham]

On 30 Aug 2011, at 19:00, Jason Zurawski wrote:
> 
> See the following minor chunk of (unverified/unchecked) schema:
> 
>> namespace nml = "http://ogf.org/schema/nml/base/20110830/"
>> 
>> NMLRelation = element nml:relation {
>>    (
>>        attribute type { "specifictype1" } &
>>        NMLLink &
>>        NMLLink
>>    ) |


This definition doesn't seem to incorporate directionality, right?

Or is this meant as a relation element that specifically takes a list of only two elements as argument?

Thinking about how we now define lists in a very implicit way, it seems to leave a lot of room for error in interpretation. 
Once you have a relation, and their targets, the interpreter has to explicitly check how many arguments there are. If more than two, you have to check both for a "next" relation and make sure one points to the other.

Also, this way of defining lists makes it near impossible to extend this to lists within lists in the future.

Jeroen.