Uncertainty elements as stand-alone elements

At the moment the metadata models for uncertainty statements can only be used within the context of si:real, si:complex or si:list elements.

From various interested users of the D-SI data model, feedback was received that re-using the uncertainty models as stand-alone elements would be an advantage: E.g.:

• Semantic based data structures like RDF or Turtle can build up data by interconnecting data types from different domains.
• Advanced uncertainty statements based on fundamental uncertainty models
• Stand-alone covariance matrix (issue #17 (closed))

Suggested Changes

Adding the uncertainty related root elements

• si:expandedUnc
• si:coverageInterval
• si:ellipsoidalRegion
• si:rectangularRegion
• si:covarianceMatrix

In addition, to further improve re-use of the element outside XML, each of the uncertainty elements is provided through a stand-alone type definition:

• si:expandedUncType
• si:coverageIntervalType
• si:ellipsoidalRegionType
• si:rectangularRegionType
• si:covarianceMatrixType