Filtering courses by subject

From Xcri

One fairly typical scenario we can imagine involves aggregators operating in specific markets (e.g. agriculture, medicine) to want to request only specific types of courses. This can be achieved by the aggregator using the simple aggregation pattern and filtering courses at the aggregator end, or alternatively the provider may support this pattern, whereby filtering is done at the provider end. This requires that the provider is not using a static XML file and can use the query parameters passed with the GET request to filter the catalog it offers.