Use case for namespace overriding (from oasis-etm)

[ronaldtse]

The oasis-etm gem implements the OASIS ETM table structure, but NISO JATS uses a different namespace for the same structure.

How can we override the namespace?

Original:

namespace "-//OASIS//DTD XML Exchange Table Model 19990315//EN", "oasis"

Inside the niso-jats gem:

namespace "http://www.niso.org/standards/z39-96/ns/oasis-exchange/table", "oasis"

We clearly do not want to manually define a second set of classes, so either:

• we find a way to create a tree of classes that have the namespace overridden
• we find a way to modify the entire tree of classes of the namespace

Maybe the first solution is cleaner.

This is blocking:

• Fix round-tripping specs oasis-etm#1

[HassanAkbar]

@ronaldtse I have some ideas related to this,

• We can use the default namespace by only defining it in the table class and then override the table class in all the gems we override.
• We can add a method to update the namespace of all the child classes, something like apply_namespace("new-namespace"). It will look through all the serializable classes in the current object, recursively in all the children, and update their namespaces to new-namespace. We can also make to check for the namespaces overridden by mapping rules like map_element :th, to: :th, namespace: 'random-namespace' and update those as well based on a parameter.

What do you suggest?