07/03/03 48821 CTB Converted to XML format This relation is used in OPUS to define which fields are used as the keyword and value fields for each deep relation. A shallow relation has a single tuple for a particular exposure, and usually contains a large number of fields. Every time the requirements change for such a relation, a new instrument is defined, or a new keyword is needed, the relation itself has to change. Take for example the relation qelogsheet. A deep relation has, in addition to the key fields which are used to join with other relations, only two fields: one which specifies the name of the variable, and a second which specifies the value of that variable for the particular observation. An example of such a deep relation is qesiparm. C31 The name of the relation in the database. eg: qesiparm C31 The name of the field in that relation which contains the variable name. eg: si_par_name C31 The name of the field in that relation which contains the value of the variable. eg: si_par_value C31 The type of the field in that relation specified by the value of the field valfield. int float double string DEEPREL_TYPE Deep relation fields OPUS unique clustered