Display the list of categories of entries available in the Longman Dictionary of Contemporary English, returning the results in the requested format.

The syntax of the API is as follows:

http://api.pearson.com/longman/dictionary/categories.[format]?apikey=[apikey]&jsonp=[callback name]

where:

• [format] is the representation to be used for returning the results, can be one of the following:
  • html
  • xml
  • json
• [callback name] when the format requested is json, the jsonp parameter is used to wrap the response in a jsonp style callback

Note: When accessing the full dataset, remember to use your full dataset api key