ISO INTERNATIONAL STANDARD 19136-1 First edition 2020-01 Geographic information Geography Markup Language (GML) - Part 1: Fundamentals Reference number ISO 19136-1:2020(E) ISO @IS0 2020 IS0 19136-1:2020(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2020 - All rights reserved IS0 19136-1:2020(E) Contents Page Foreword ..X Introduction .xii 1 Scope. 2 Normative references 3 Terms, definitions, symbols and abbreviated terms. ..2 3.1 Terms and definitions. .2 3.2 Abbreviated terms... 4 Conformance. .10 4.1 Conformance requirements. ..10 4.2 Conformance classes related to GML application schemas. .10 4.3 Conformance classes related to GML profiles. .11 4.4 Conformance classes related to GML documents ..12 4.5 Conformance classes related to software implementations. ..12 5 Conventions .13 5.1 XML namespaces .13 5.2 Versioning. ..13 5.3 Deprecated parts of previous versions of GML ..13 5.4 UML notation ..13 5.5 XML Schema ..15 6 Overview of the GML schema .15 6.1 GML schema ..15 6.2 GML application schemas. ..15 6.3 Relationship between the IS0 19100 series of International Standards, the GML schema and GML application schemas. ..16 6.4 Organization of this document. ..17 6.5 Deprecated and experimental schema components .18 7 GML schema - General rules and base schema components ..19 7.1 GML model and syntax .19 7.1.1 GML instance documents .19 7.1.2 Lexical conventions. .20 7.1.3 XML Schema definition of GML language .20 7.2 gmlBase schema components.. .21 7.2.1 Goals of base schema components 21 7.2.2 Base objects. 21 7.2.3 GML properties. 22 7.2.4 Standard properties of GML objects .27 7.2.5 Collections of GML objects . .27 7.2.6 Metadata .28 8 GML schema - Xlinks and basic types .31 8.1 Xlinks — Object associations and remote properties .31 8.2 Basic types. .33 8.2.1 Overview. .33 8.2.2 Relationship with IS0 19103 .33 8.2.3 Simple types. .33 8.2.4 Lists .38 9 GML schema Features. .40 9.1 General concepts .40 9.2 Relationship with IS0 19109 .40 9.3 Features. .41 9.3.1 AbstractFeatureType. 9.3.2 AbstractFeature 41 @ IS0 2020 - All rights reserved iii IS0 19136-1:2020(E) 9.4 Standard feature properties. 41 9.4.1 boundedBy, BoundingShapeType, EnvelopeWithTimePeriod, EnvelopeWithTimePeriodType.. 41 9.4.2 locationName, locationReference. 42 9.4.3 FeaturePropertyType, FeatureArrayPropertyType 43 9.5 Geometry properties.. 43 9.6 Topology properties. 44 9.7 Temporal properties 45 9.8 Defining application-specific feature types. 46 9.9 Feature collections. 47 9.9.1 GMLfeaturecollections 47 9.9.2 AbstractFeatureMemberType and derived property types 48 9.10 Spatial reference system used in a feature or feature collection. 48 10 GML schema Geometric primitives 49 10.1 General concepts 49 10.1.1 Overview 49 10.1.2 Relationship with IS0 19107 49 10.1.3 Abstract geometry 50 10.1.4 Coordinate geometry, vectors and envelopes 52 10.2 Abstract geometric primitives. 54 10.2.1 AbstractGeometricPrimitiveType, AbstractGeometricPrimitive 54 10.2.2 GeometricPrimitivePropertyType 55 10.3 Geometric primitives (O-dimensional) 55 10.3.1 PointType, Point. 55 10.3.2 PointPropertyType, pointProperty 55 10.3.3 PointArrayPropertyType, pointArrayProperty 56 10.4 Geometric primitives (1-dimensional) 56 10.4.1 AbstractCurveType, AbstractCurve 56 10.4.2 CurvePropertyType, curveProperty 56 10.4.3 CurveArrayPropertyType, curveArrayProperty 57 10.4.4 LineStringType, LineString. 57 10.4.5 CurveType, Curve. 57 10.4.6 OrientableCurveType, OrientableCurve, baseCurve 58 10.4.7 Curve segments. 58 10.5 Geometric primitives (2-dimensional) 67 10.5.1 AbstractSurfaceType, AbstractSurface 67 10.5.2