ISO 23950:1998 pdf free download – Information and documentation- Information retrieval (Z39.50)一Application service definition and protocol specification.
Element set name– An element specification in the form of a primitive name.
Element specification- -An instance of an element specification format, or an element set name. An element specification transforms an abstract database record into another instance of the abstract database record (this may be a null transformation).
The element specification selects elements from the abstract database record, and possibly also specifies variant forms for those elements.
Element specification format- 一A structure used to express an element specification.
Element specification identifier- – The object identifier of an element specification format, or an element set name.
Exceptional record size– The maximum size of the record that may be included in a Present response, in the special case when a single, exceptionally large record (i.e.. larger than preferred -message-size) is requested.
Facility- A logical group of Z39.50 services; in some cases, a single service. For example, the Retrieval facility consists of the Present service and the Segment service; the Search facility consists of the Search service. Alternatively, a facility might not consist of services, but instead might use services of other facilities. For example. the Explain facility does not define any services, but uses the Search and Present services.
Final fragment- A fragment that ends at the end of a record. See F ragment.
Fragment- A proper substring of a record. (This definition is meaningful only in the context of level-2 segmentation, described in section 3.3.3; within that section, a record is considered to be a string of bytes.)
GRS- Generic Record Syntax.
Initiating request- A request that initiates an operation.
Intermediate fragment- A fragment that neither starts at the beginning nor ends at the end of a record. See Fragment.
IR- Information Retrieval.
Item- (1) A result set item. (2) A bibliographic item; see ISO 10160.
Maximum segment size -The largest allowable segment of an aggregate Present response (when segmentation is in effect).
Name A linguistic construct, expressed in some language, that corresponds to an object. A name denotes (i.e., identifies) the object to which it is bound.
Non-confirmed service- A service that is defined in terms of a request from the origin or target, with no corresponding response.
For example, Segment is a non-confirmed service initiated by the target. See also Confirmed service.
Object identifier- An unambiguous, globally-recognized, registered identifier for a data object, assigned by a registration authority .
OID- See Object identifier.
Operation An initiating request and the corresponding terminating response, along with intervening related messages. For example, a Search operation always includes a Search request and Search response, and may also include access control and resource control messages. Multiple concurrent operations may occur within a Z association.