Change <annotation> namespace

[cannin]

@amazein @ibalaur What was the reasoning for having the annotation xmlns as libsbgn? Is this how SBML and others do it?

 <extension>
  <annotation xmlns="" xmlns:ns2="http://sbgn.org/libsbgn/0.2">
    <rdf:RDF ... >

[draeger]

This is, to my understanding, somewhat problematic to couple the namespace to a specific version of one specific implementing library. Didn't we agree to move away from this practice?

[cannin]

@draeger What would SBML do in this scenario? Especially since the annotation tag is meant to be borrowed from SBML.

[draeger]

Generally, the namespace is just some unique identifier. Hence, the library version is not strictly illegal and should work in principle. However, it can cause trouble if a new version of the library writes files with a namespace that refers to some older library. In SBML there would be a namespace declaration consisting of the Level and Version of the corresponding SBML specification. So, SBGNML could also use such a schema, for instance, "http://sbgn.org/sbgnml/0.3".