ISO INTERNATIONAL 23950 STANDARD First edition 1998-07-15 Information and documentation Information retrieval (z39.50) Application service definition and protocol specification Informationetdocumentation—Recherched"information(Z39.50) Definitionduservicede I'applicationetspeécificationduprotocole ISo Reference number ISO 23950:1998(E) ISO23950:1998(E) Foreword ISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(iSO member bodies).The work of preparing International Standards is normally carried out through isO technica committees.Eachmemberbody interested ina subjectforwhichatechnical committeehasbeenestablishedhas liaison with isO, also take part in the work.isO collaborates closely with the International Electrotechnical Commission (IEC)on allmatters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting parallel with its approval by the IsO member bodies. Annexes 1 to 12 form an integral part of this International Standard. Annexes 13 to 16 are for information only. @ISO1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced microfilm, without permission in writing from the publisher. International OrganizationforStandardization Casepostale 56·CH-1211Geneve20·Switzerland Internet [email protected] Printed in Switzerland @ISO ISO23950:1998(E) Contents Page 1. Introduction .. 1.1 Scope and Field of Application 1.2 1.3 Referenced Standards .. 2. Definitions ...... 3. Information Retrieval Service 3.1 Model and Characteristics of the Information Retrieval Service 3.1.1 Z39.50 Services. 3.1.2 Z39.50 Operations ... 3.1.3 Model of a Database 3.1.4 Searching a Database 3.1.5 Retrieving Records from a Database 3.1.6 Model of a Result Set .. 3.1.7 Model of Extended Services ... 3.1.8 Explain 3.2 Facilities of the Information Retrieval Service 3.2.1 Initialization Facility ... 3.2.1.1 Init Service 3.2.2 Search Facility 3.2.2.1 Search Service 3.2.3 Retrieval Facility ... 3.2.3.1 Present Service 3.2.3.2 Segment Service 3.2.4 Result-set-delete Facility 18 3.2.4.1 Delete Service 18 3.2.5 Access Control Facility .... 20 3.2.5.1 Access-control Service 20 3.2.6 Accounting/ResourceControlFacility 3.2.6.1 Resource-control Service 3.2.6.2 Trigger-resource-control Service 3.2.6.3 Resource-report Service 3.2.7 Sort Facility 3.2.7.1 Sort Service.. 24 3.2.8 Browse Facility 3.2.8.1 Scan Service 25 3.2.9 Extended Services Facility 3.2.9.1 Extended Services Service 27 3.2.9.2 The Extended Services Database 29 3.2.9.3 Owners and Permissions 30 3.2.9.4 Aborted Operations ... 30 3.2.10 Explain Facility.. 30 3.2.10.1 Searching the Explain Database . 31 3.2.10.2 Retrieval of Explain Records .. 32 3.2.10.3 Detailed Descriptions ofthe Information Categories 33 3.2.11 Termination Facility 39 3.2.11.1 Close Service 39 @ISO ISO23950:1998(E) 3.3 Message/Record Size and Segmentation ... 40 3.3.1 Procedures When No Segmentation Is in Effect 40 3.3.2 Level 1 Segmentation . 41 3.3.3 Level 2 Segmentation . 42 42 3.3.3.1 Fragments 3.3.3.2 Segment Size, Record Size, and Segment Count 42 3.3.3.3 Segmentation Procedures ... 42 3.4 Operations and Reference-id 44 3.5 Concurrent Operations ... 44 45 3.6 Composition Specification. 3.6.1 Comp-spec Specified 45 3.6.2 Comp-spec Omitted 45 46 3.6.3 3.7 Type-1 and Type-101 Queries .. 46 3.7.1 Representation and Evaluation of the Type-1 and Type-101 Queries 47 3.7.2 Proximity . 47 3.7.2.1 The Proximity Test ... 47 3.7.2.2Extended Result Set Model for Proximity 48 Restriction and the Extended Result Set Model . 3.7.3 48 4. Protocol Specification .... 48 4.1 Abstract Syntax and ASN.1Specification of Z39.50APDUs 48 4.2 Protocol Procedures ... 61 4.2.1 Presentation and Association Control Services 61 4.2.1.1 Service Provided by the Presentation Layer 61 4.2.1.2 Association Control Services .. 61 4.2.2 Protocol Model 61 4.2.3 State Tables ... 62 4.2.4 Protoc