ISO INTERNATIONAL STANDARD 19143 First edition 2010-10-15 Geographic information Filter encoding Information géographique - Codage de filtres Reference number ISO 19143:2010(E) @ ISO 2010 ISO 19143:2010(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The Iso Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation COPYRIGHTPROTECTEDDOCUMENT ? ISO2010 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 IsO's member body 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 [email protected] Web www.iso.org Published in Switzerland ISO2010-All rightsreserved ISO19143:2010(E) Contents Page Foreword .iv Introduction 1 Scope 2 Conformance 3 Normative references.. 3 4 Terms and definitions . 5 Conventions 5.1 Abbreviated terms 5.2 UML notation.. 5.3 Use of examples 5.4 Namespaces 5.5 KvP-encoded parameter lists 5.6 XML Schema fragments.... Query expressions . 6.1 .9 6.2 Abstract query expressions 6.3 Ad hoc query expression.... 10 7 Filter... 7.1 General considerations.. 13 7.2 14 7.3 Expressions 14 7.4 Value references. 15 7.5 Literals 17 7.6 Functions... 18 7.7 Comparison operators. 19 7.8 Spatial operators, 22 7.9 Temporal operators .26 7.10 Logicaloperators 28 7.11 Object identifiers 30 7.12 Extensions 7.13 Filter capabilities . 33 7.14 Encoding .35 8 Sorting.. 42 8.1 General considerations 8.2 Encoding ..... 42 8.3 Exceptions.. 43 Annex A (normative) Conformance testing..... 44 Annex B (informative) Filter schema definitions ..... Annex C (informative) Examples..... Annex D (informative) EBNF for XPath subset.... Annex E (informative) Abstract model... Bibliography... alion'ghts reserved ili ISO 19143:2010(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 19143 was prepared by Technical Committee ISO/TC 211, Geographic information/Geomatics, in collaboration with the Open Geospatial Consortium Inc. (OGC), @ IsO 2010 - All rights reserved ISO 19143:2010(E) Introduction Filter encoding was originated within the OGC. A fundamental operation performed on a set of data or resources is that of querying in order to obtain a subset of the data which contains certain desired information that satisfies some query criteria and which is also, perhaps,sortedinsomespecifiedmanner. The term “projection clause" is used to describe an encoding for specifyi