This is the HEEP request schema, used to structure requests made from a HEEP client to a HEEP Service. It is part of the MIDAS namespace. Root node for the HEEP request. Use either session or authinfo, not both Empty authentication element containing username and passwd elements. Authentication username. Authentication password. Empty element containing structured informaiton about the request The type of request: GetData, GetCap, GetQuerySummary The dataset(s), capabilitites, or other requested elements Used for data queries only; this empty element contains data used to build the query itself Node(s) to sort the results by. Expressed in xpath format. Record to start returning results on. Base 1 Number of records to return from the results of a given select set. String or number criterion / term or identifier being searched on. The Boolean operator to be use in conjunction with the preceeding criterion xpath node used to indicate the unit of information being queried (will be mapped to a field in the database by the HEEP Service designers) One of a controlled list of string and integer comparisons: is exactly, isgreaterthan, beginswith, etc. (default: isexactly) Enclosed set of search criteria; can contain criteria/on or nested bracketsets The Boolean operator to be use in conjunction with the preceeding criterion xpath node used to indicate the unit of information being queried (will be mapped to a field in the database by the HEEP Service designers)