Schematron validation
Property element may not carry both a reference to an object and contain an object.
Property element must either carry a reference to an object or contain an object.
Semantically weakly typed WOML objects identified by a known symbol defined outside WOML schemas.
Author: Ilkka Rinne / FMI 2010.
A single meteorological symbol fixed at a geospatial point or
point-like location.
Meteorological symbol with direction information. An example could be a wind arrow symbol.
Reference to a meteorological phenomena or property defined outside WOML.
A MeteorologicalSymbol is only identified by a reference to a catalog ("definitionReference")
To be used when using this object type as property of a GML object
type according to the GML object-property-association model (it is not allowed for
GML Objects to contain other GML Objects as direct children). Enables referencing to
an existing object using xlink:href attribute.