XSLT to convert Filemaker's REST web-service XML response into clean JSON
Adapted from the original Six Fried Rice XSLT here http://sixfriedrice.com/wp/products/filemaker-to-json-converter/
* single quotes to JSON-standard double-quotes
* removed "fieldDefinitions" block (personal preference)
* stopped every field value being presented as an [ array ] even when not a "repeating field"
* added whitespace escaping code
The white-space escaping code was entirely cribbed from