Hi, does anyone know if there is possible to get the JCE Microdata plugin to fetch microdata itemtypes from another source than schema.org?

The Norwegian Consumer Council has started a service to list electricity prices from all electricity companies in Norway, based on microdata from the companies websites.
Problem is, the itemtypes are legacy, and cannot be found on schema.org.
I am currently involved in building new web pages for my local electricity company, and would like it to be possible for the company themselves to maintain the microdata markup whenever they need to change something.

How would one do such a change in JCE plugin, if at all possible?

TIA
Christian
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