IS 16626 : Part 1 : 2025/ISO 19136-1 : 2020 Geographic Information Geography Markup Language (GML) - Part 1 Fundamentals
NATIONAL FOREWORD
This Indian Standard (Part 1) (First Revision) which is identical to ISO 19136-1 : 2020 'Geographic information - Geography markup language (GML) - Part 1: Fundamentals' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Geospatial Information Sectional Committee and the approval of the Electronics and Information Technology Division Council.
IS 16626 : 2017 'Geographic Information - Geography markup language (GML)' was first published in 2017 and was identical to ISO 19136 : 2007. ISO 19136 has been divided in 2 parts. This standard has been revised to align with latest version of ISO 19136-1 : 2020.
The main changes compared to the previous edition are as follows:
a) The XML attribute gml:id in gml:AbstractGmlType has been made optional;
b) The elements gml:Abstractring and gml:Shell have been added to the substitution Groups gml:AbstractCurve and gml:Abstract Surface respectively;
c) The types gml:AbstractRingType and gml:ShellType are now extended from base types gml:AbstractCurveType and gml:AbstractSurfaceType respectively; and
d) These changes correct inconsistencies with ISO 19107 without breaking the validity of instance documents created using the GML 3.2.1 schema. That is, all GML 3.2 instance documents that are valid against the GML 3.2.1 schema are also valid against the GML 3.2.2 schema.
This standard is published in two parts. The other part in this series is:
Part 2 Extended schemas and encoding rules
The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.