how to use references

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Hi,

I'm trying to use this plugin but I'm new to hapi, nodejs, and json-schema.
I have created 2 files, one describe an element, and the other an array of the first element. I'm trying to use the $ref property but without success.
I'm not sure of what I should put in it. By default I should specify the id of the first element, but as it's not in the same file it's not defined. As the files are not online yet I can't use a fixed url either. So I tried with relative path (./element.json) or with "file://" syntax but with no success yet. Maybe I'm not is the good working directory.

Could someone tell me if such a think is possible with ratify, and how to achieve this ?

Thanks.