[tdwg-tapir] Attribute nodes in output model mapping

Dear all,

I recently noticed that for some reason the specification was saying that attribute nodes in output model mappings should be represented as "parent_node@attr_node" instead of "parent_node/@attr_node". Markus also agreed that this is not consistent with XPath and with the original integration document, so we took the liberty to change the specification and the provider software.

Although it's really a minor change, I wanted to send out this message because it can affect people that are already preparing the first output models and testing providers.

Best Regards, -- Renato