Retrieval mechanism

The retrieval mechanism is dependent on the kind of entry that is executed.

1. Entries that collect data through a HTTP request
   Each time such an entry is executed in an ITP Model the XML WebServices Connection constructs a HTTP message. This message is send over TCP/IP to a HTTP server. After processing the request, the server returns an HTTP answer containing data in XML format. The XML WebServices Connection extracts the XML data, converts it to a set of records according to rules in the DID, and returns this to ITP to be processed further.
2. Entries that collect data in earlier in the model collected XML structures
   Entries as described in the previous item can return data in an XML substructure. The XML WebServices Connection can retrieve the data from these substructures by means of subentries. The XML WebServices Connection will treat this XML structure in the same way as the XML File Connection does.

Since the data retrieval mechanism of the two kind of entries varies significantly, the retrieval mechanism is discussed in separate chapters.