GENIE Gridspec Diagrams Discretisation

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The following grid tile discretisations should be supported by the gridspec. Currently the gridspec only provides support for logically rectangular grids (LRGs), with limited support for unstructured grids; Balaji proposes that the gridspec should be extended by the appropriate domain experts to cover other discretisations.

<xs:simpleType name="discretization_type">
  <xs:annotation>
    <xs:documentation xml:lang="en">The way a grid tile is split into cells, e.g. logically_rectangular.</xs:documentation>
  </xs:annotation>
  <xs:restriction base="enum_type">
    <xs:enumeration value="logically_rectangular"/>
    <xs:enumeration value="structured_triangular"/>
    <xs:enumeration value="unstructured_triangular"/>
    <xs:enumeration value="unstructured_polygonal"/>
    <xs:enumeration value="pixel-based_catchment"/>
  </xs:restriction>
</xs:simpleType>