UNE-EN ISO 19136-2:2018

The Geography Markup Language (GML) is an XML encoding in compliance with ISO 19118 for the

transport and storage of geographic information modelled in accordance with the conceptual modelling

framework used in the ISO 19100- series of International Standards and including both the spatial and

non-spatial properties of geographic features.

This part of ISO 19136 defines the XML Schema syntax, mechanisms and conventions that:

provide an open, vendor-neutral framework for the description of geospatial application schemas

for the transport and storage of geographic information in XML;

allow profiles that support proper subsets of GML framework descriptive capabilities;

support the description of geospatial application schemas for specialized domains and

information communities;

enable the creation and maintenance of linked geographic application schemas and datasets;

support the storage and transport of application schemas and datasets;

increase the ability of organizations to share geographic application schemas and the information

they describe.

Implementers may decide to store geographic application schemas and information in GML, or they

may decide to convert from some other storage format on demand and use GML only for schema and

data transport.

This part of ISO 19136 builds on ISO 19136:2007 (GML 3.2), and extends it with additional schema

components and requirements.

NOTE If an ISO 19109 conformant application schema described in UML is used as the basis for the storage

and transportation of geographic information, this part of ISO 19136 provides normative rules for the mapping of

such an application schema to a GML application schema in XML Schema and, as such, to an XML encoding for data

with a logical structure in accordance with the ISO 19109 conformant application schema.