Schema mapping for INSPIRE data theme LandCover is incomplete

[tfr42]

Using the AppSchemaMapper to derive the SQL DDL and deegree SQLFeatureStore configuration based on the GML application schema ​http://inspire.ec.europa.eu/schemas/lcv/4.0/LandCoverVector.xsd the generated mapping file is incomplete. It misses mappings for:

• gml:description
• lcv:extent
• lcv:nomenclatureDocumentation and requires manual adaptation to fix the mapping.

[tfr42]

First analysis shows:

• gml:description: Basically, no properties in the GML namespace are mapped
• lcv:extent: Has a cycle:

  [21:07:31]  WARN: [AppSchemaMapper] Unable to create relational mapping for property type '{http://inspire.ec.europa.eu/schemas/lcv/4.0}extent': Detected unhandled cycle 'Path: 
  {http://www.isotc211.org/2005/gmd}EX_Extent -> 
  {http://www.isotc211.org/2005/gmd}geographicElement -> 
  {http://www.isotc211.org/2005/gmd}AbstractEX_GeographicExtent -> 
  {http://www.isotc211.org/2005/gmd}geographicIdentifier -> 
  {http://www.isotc211.org/2005/gmd}MD_Identifier -> 
  {http://www.isotc211.org/2005/gmd}authority -> 
  {http://www.isotc211.org/2005/gmd}CI_Citation -> 
  {http://www.isotc211.org/2005/gmd}identifier -> '.

  and the hot fix to handle cycles is not solving this issue due to:

  [21:38:06]  WARN: [AppSchemaMapper] Mapping property type '{http://inspire.ec.europa.eu/schemas/lcv/4.0}extent' exceeds complexity limit: 170721

• lcv:nomenclatureDocumentation: Similar as for the element <lcv:extent/>:

  [21:07:31]  WARN: [AppSchemaMapper] Mapping property type '{http://inspire.ec.europa.eu/schemas/lcv/4.0}nomenclatureDocumentation' exceeds complexity limit: 591

[tfr42]

A strategy to flatten such schemas may be required, see #786 for more information.

[tfr42]

817 fixes the issue with cyclic references.