1、 Reference numberISO/IEC 11179-4:2004(E)ISO/IEC 2004 INTERNATIONAL STANDARD ISO/IEC11179-4Second edition2004-07-15Information technology Metadata registries(MDR)Part 4:Formulation of data definitions Technologies de linformation Registres de mtadonnes(RM)Partie 4:Formulation des dfinitions de donnes
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5、below.ISO/IEC 2004 All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either ISO at the address below or ISOs member body
6、 in the country of the requester.ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel.+41 22 749 01 11 Fax +41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2004 All rights reserved ISO/IEC 11179-4:2004(E)ISO/IEC 2004 All rights reserved iii Contents
7、Page Foreword.iv Introduction.v 1 Scope.1 2 Conformance.1 3 Terms and definitions.1 4 Summary of data definition requirements and recommendations.3 4.1 Requirements.3 4.2 Recommendations.3 5 Provisions.4 5.1 Premises.4 5.2 Requirements.4 5.3 Recommendations.6 Bibliography.9 ISO/IEC 11179-4:2004(E)iv
8、 ISO/IEC 2004 All rights reserved Foreword ISO(the International Organization for Standardization)and IEC(the International Electrotechnical Commission)form the specialized system for worldwide standardization.National bodies that are members of ISO or IEC participate in the development of Internati
9、onal Standards through technical committees established by the respective organization to deal with particular fields of technical activity.ISO and IEC technical committees collaborate in fields of mutual interest.Other international organizations,governmental and non-governmental,in liaison with IS
10、O and IEC,also take part in the work.In the field of information technology,ISO and IEC have established a joint technical committee,ISO/IEC JTC 1.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives,Part 2.The main task of the joint technical committee is
11、 to prepare International Standards.Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting.Publication as an International Standard requires approval by at least 75%of the national bodies casting a vote.Attention is drawn to the possibilit
12、y that some of the elements of this document may be the subject of patent rights.ISO and IEC shall not be held responsible for identifying any or all such patent rights.ISO/IEC 11179-4 was prepared by Joint Technical Committee ISO/IEC JTC 1,Information technology,Subcommittee SC 32,Data management a
13、nd interchange.This second edition cancels and replaces the first edition(ISO/IEC 11179-4:1995),which has been technically revised.ISO/IEC 11179 consists of the following parts,under the general title Information technology Metadata registries(MDR):Part 1:Framework Part 3:Registry metamodel and basi
14、c attributes Part 4:Formulation of data definitions Part 5:Naming and identification principles Part 6:Registration The following part is under preparation:Part 2:Classification ISO/IEC 11179-4:2004(E)ISO/IEC 2004 All rights reserved v Introduction Data processing and electronic data interchange rel
15、y heavily on accurate,reliable,controllable and verifiable data recorded in databases.A prerequisite for correct and proper use and interpretation of data is that both users and owners of data have a common understanding of the meaning and representation of the data.To facilitate this common underst
16、anding,a number of characteristics,or attributes of the data have to be defined.These characteristics of data are known as“metadata”,that is,“data that describes data”.This part of ISO/IEC 11179 specifies requirements and recommendations on the formulation of data definitions that are specified in Metadata Registries.The purpose of these definitions is to specify,describe,explain,and clarify the meaning of data,to promote the standardization or reuse of data elements,and to promote data sharing