public void AffixTags(string collection, string id, IEnumerable <Tag> tags)
{
if (tags == null)
{
throw new SparkException("No tags specified on the request");
}
Uri key = BuildKey(collection, id);
BundleEntry entry = store.Get(key);
if (entry == null)
{
throw new SparkException(HttpStatusCode.NotFound, "Could not set tags. The resource was not found.");
}
entry.AffixTags(tags);
store.Add(entry);
}