Cancel Fullscreen
Loading...
 

This is the static archive copy of the old wiswiki, decommissioned on June 1 2020

Print

MDG_Schema

Regulatory XSD and Schematron

XSD (XML Schema)


The word "schema" in the geospatial and IT spheres stands for formally described structure of something,
which may be abstract (conceptual schema) or concrete (XML schema, database schema, ...).

The WIS Discovery Metadata must be compliant to the ISO standard of geographical metadata - it must have an abstract structure defined by ISO 19115, and must be encoded in XML as defined in ISO 19139. The latter standard provides computer-readable (formal) description in "W3C XML Schema" language, which is often called XSD for the filename suffix.

http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/

There are many tools to validate a given metadata record against XSD (see page MDG_Test for details).

Schematron


The WIS Discovery Metadata must also be compliant to additional restrictions given in the specification document of WMO Core Metadata Profile. Although some of the restrictions can be expressed in XSD, WMO chose not to provide "WMO version of XSD" as that would be confusing and hard to maintain.

Rather WMO is developing the computer-readable tests in another language called Schematron (ISO/IEC 19757-3:2006). The test sutite is placed at
http://wis.wmo.int/2012/metadata/validationTestSuite/ .

There are many tools to validate a given metadata record against Schematron (see page MDG_Test for details).


Page last modified on Friday 01 of August, 2014 14:46:27 CEST