The Core module defines the basic components of the CityGML conceptual model. This includes abstract base classes that define the core properties of more specialized thematic classes defined in other modules as well as concrete classes that are common to other modules, for example basic data types. ADEOfAbstractAppearance acts as a hook to define properties within an ADE that are to be added to AbstractAppearance. ADEOfAbstractCityObject acts as a hook to define properties within an ADE that are to be added to AbstractCityObject. ADEOfAbstractDynamizer acts as a hook to define properties within an ADE that are to be added to AbstractDynamizer. ADEOfAbstractFeature acts as a hook to define properties within an ADE that are to be added to AbstractFeature. ADEOfAbstractFeatureWithLifespan acts as a hook to define properties within an ADE that are to be added to AbstractFeatureWithLifespan. ADEOfAbstractLogicalSpace acts as a hook to define properties within an ADE that are to be added to AbstractLogicalSpace. ADEOfAbstractOccupiedSpace acts as a hook to define properties within an ADE that are to be added to AbstractOccupiedSpace. ADEOfAbstractPhysicalSpace acts as a hook to define properties within an ADE that are to be added to AbstractPhysicalSpace. ADEOfAbstractPointCloud acts as a hook to define properties within an ADE that are to be added to AbstractPointCloud. ADEOfAbstractSpace acts as a hook to define properties within an ADE that are to be added to AbstractSpace. ADEOfAbstractSpaceBoundary acts as a hook to define properties within an ADE that are to be added to AbstractSpaceBoundary. ADEOfAbstractThematicSurface acts as a hook to define properties within an ADE that are to be added to AbstractThematicSurface. ADEOfAbstractUnoccupiedSpace acts as a hook to define properties within an ADE that are to be added to AbstractUnoccupiedSpace. ADEOfAbstractVersion acts as a hook to define properties within an ADE that are to be added to AbstractVersion. ADEOfAbstractVersionTransition acts as a hook to define properties within an ADE that are to be added to AbstractVersionTransition. ADEOfAddress acts as a hook to define properties within an ADE that are to be added to an Address. ADEOfCityModel acts as a hook to define properties within an ADE that are to be added to a CityModel. ADEOfClosureSurface acts as a hook to define properties within an ADE that are to be added to a ClosureSurface. AbstractAppearance is the abstract superclass to represent any kind of appearance objects. Augments AbstractAppearance with properties defined in an ADE. AbstractCityObject is the abstract superclass of all thematic classes within the CityGML Conceptual Model. References external objects in other information systems that have a relation to the city object. Relates generalized representations of the same real-world object in different Levels of Detail to the city object. The direction of this relation is from the city object to the corresponding generalized city objects. core:AbstractCityObject Describes the vertical position of the city object relative to the surrounding terrain. Describes the vertical position of the city object relative to the surrounding water surface. Relates appearances to the city object. Relates generic attributes to the city object. Relates Dynamizer objects to the city object. These allow timeseries data to override static attribute values of the city object. Augments AbstractCityObject with properties defined in an ADE. AbstractDynamizer is the abstract superclass to represent Dynamizer objects. Augments AbstractDynamizer with properties defined in an ADE. AbstractFeature is the abstract superclass of all feature types within the CityGML Conceptual Model. Augments AbstractFeature with properties defined in an ADE. AbstractFeatureWithLifespan is the base class for all CityGML features. This class allows the optional specification of the real-world and database times for the existence of each feature. Indicates the date at which a CityGML feature was added to the CityModel. Indicates the date at which a CityGML feature was removed from the CityModel. Indicates the date at which a CityGML feature started to exist in the real world. Indicates the date at which a CityGML feature ended to exist in the real world. Augments AbstractFeatureWithLifespan with properties defined in an ADE. AbstractGenericAttribute is the abstract superclass for all types of generic attributes. AbstractLogicalSpace is the abstract superclass for all types of logical spaces. Logical space refers to spaces that are not bounded by physical surfaces but are defined according to thematic considerations. Augments AbstractLogicalSpace with properties defined in an ADE. AbstractOccupiedSpace is the abstract superclass for all types of physically occupied spaces. Occupied space refers to spaces that are partially or entirely filled with matter. Relates to an implicit geometry that represents the occupied space in Level of Detail 1. Relates to an implicit geometry that represents the occupied space in Level of Detail 2. Relates to an implicit geometry that represents the occupied space in Level of Detail 3. Augments AbstractOccupiedSpace with properties defined in an ADE. AbstractPhysicalSpace is the abstract superclass for all types of physical spaces. Physical space refers to spaces that are fully or partially bounded by physical objects. Relates to a 3D MultiCurve geometry that represents the terrain intersection curve of the physical space in Level of Detail 1. Relates to a 3D MultiCurve geometry that represents the terrain intersection curve of the physical space in Level of Detail 2. Relates to a 3D MultiCurve geometry that represents the terrain intersection curve of the physical space in Level of Detail 3. Relates to a 3D PointCloud that represents the physical space. Augments AbstractPhysicalSpace with properties defined in an ADE. AbstractPointCloud is the abstract superclass to represent PointCloud objects. Augments AbstractPointCloud with properties defined in an ADE. AbstractSpace is the abstract superclass for all types of spaces. A space is an entity of volumetric extent in the real world. Specifies the degree of openness of a space. Specifies qualified volumes related to the space. Specifies qualified areas related to the space. Relates to surfaces that bound the space. Relates to a 3D Point geometry that represents the space in Level of Detail 0. Relates to a 3D MultiSurface geometry that represents the space in Level of Detail 0. Relates to a 3D MultiCurve geometry that represents the space in Level of Detail 0. Relates to a 3D Solid geometry that represents the space in Level of Detail 1. Relates to a 3D Solid geometry that represents the space in Level of Detail 2. Relates to a 3D MultiSurface geometry that represents the space in Level of Detail 2. Relates to a 3D MultiCurve geometry that represents the space in Level of Detail 2. Relates to a 3D Solid geometry that represents the space in Level of Detail 3. Relates to a 3D MultiSurface geometry that represents the space in Level of Detail 3. Relates to a 3D MultiCurve geometry that represents the space in Level of Detail 3. Augments AbstractSpace with properties defined in an ADE. AbstractSpaceBoundary is the abstract superclass for all types of space boundaries. A space boundary is an entity with areal extent in the real world. Space boundaries are objects that bound a Space. They also realize the contact between adjacent spaces. Augments AbstractSpaceBoundary with properties defined in an ADE. AbstractThematicSurface is the abstract superclass for all types of thematic surfaces. Specifies qualified areas related to the thematic surface. Relates to a 3D MultiCurve geometry that represents the thematic surface in Level of Detail 0. Relates to a 3D MultiSurface geometry that represents the thematic surface in Level of Detail 0. Relates to a 3D MultiSurface geometry that represents the thematic surface in Level of Detail 1. Relates to a 3D MultiSurface geometry that represents the thematic surface in Level of Detail 2. Relates to a 3D MultiSurface geometry that represents the thematic surface in Level of Detail 3. Relates to a 3D PointCloud that represents the thematic surface. Augments AbstractThematicSurface with properties defined in an ADE. AbstractUnoccupiedSpace is the abstract superclass for all types of physically unoccupied spaces. Unoccupied space refers to spaces that are entirely or mostly free of matter. Augments AbstractUnoccupiedSpace with properties defined in an ADE. AbstractVersion is the abstract superclass to represent Version objects. Augments AbstractVersion with properties defined in an ADE. AbstractVersionTransition is the abstract superclass to represent VersionTransition objects. Augments AbstractVersionTransition with properties defined in an ADE. Address represents an address of a city object. Relates an OASIS address object to the Address. Relates to the MultiPoint geometry of the Address. The geometry relates the address spatially to a city object. Augments the Address with properties defined in an ADE. CityModel is the container for all objects belonging to a city model. Specifies the local engineering coordinate reference system of the CityModel that can be provided inline the CityModel instead of referencing a well-known CRS definition. The definition of an engineering CRS requires an anchor point which relates the origin of the local coordinate system to a point on the earth's surface in order to facilitate the transformation of coordinates from the local engineering CRS. Relates to all objects that are part of the CityModel. Augments the CityModel with properties defined in an ADE. CityModelMember is a union type that enumerates the different types of objects that can occur as members of a city model. Specifies the city objects that are part of the CityModel. Specifies the appearances of the CityModel. Specifies the different versions of the CityModel. Specifies the transitions between the different versions of the CityModel. Specifies the feature objects that are part of the CityModel. It allows to include objects that are not derived from a class defined in the CityGML conceptual model, but from the ISO 19109 class AnyFeature. CityObjectRelation represents a specific relation from the city object in which the relation is included to another city object. Relates generic attributes to the CityObjectRelation. core:AbstractCityObject ClosureSurface is a special type of thematic surface used to close holes in volumetric objects. Closure surfaces are virtual (non-physical) surfaces. Augments the ClosureSurface with properties defined in an ADE. DoubleBetween0and1 is a basic type for values, which are greater or equal than 0 and less or equal than 1. The type is used for color encoding, for example. ExternalReference is a reference to a corresponding object in another information system, for example in the German cadastre (ALKIS), the German topographic information system (ATKIS), or the OS UK MasterMap®. Specifies the URI that points to the object in the external information system. Specifies the URI that points to the external information system. Specifies a URI that additionally qualifies the ExternalReference. The URI can point to a definition from an external ontology (e.g., the sameAs relation from OWL) and allows for mapping the ExternalReference to RDF triples. ImplicitGeometry is a geometry representation where the shape is stored only once as a prototypical geometry. Examples are a tree or other vegetation object, a traffic light or a traffic sign. This prototypic geometry object can be re-used or referenced many times, wherever the corresponding feature occurs in the 3D city model. Specifies the mathematical transformation (translation, rotation, and scaling) between the prototypical geometry and the actual spatial position of the object. Specifies the MIME type of the external file that stores the prototypical geometry. Specifies the URI that points to the prototypical geometry stored in an external file. Relates to a 3D Point geometry that represents the base point of the object in the world coordinate system. Relates to a prototypical geometry in a local coordinate system stored inline with the city model. Relates appearances to the ImplicitGeometry. IntegerBetween0and3 is a basic type for integer values, which are greater or equal than 0 and less or equal than 3. The type is used for encoding the LOD number. Occupancy is an application-dependent indication of what is contained by a feature. Indicates the number of occupants contained by a feature. Indicates the time period the occupants are contained by a feature. Indicates the specific type of the occupants that are contained by a feature. QualifiedArea is an application-dependent measure of the area of a space or of a thematic surface. Specifies the value of the QualifiedArea. Indicates the specific type of the QualifiedArea. QualifiedVolume is an application-dependent measure of the volume of a space. Specifies the value of the QualifiedVolume. Indicates the specific type of the QualifiedVolume. RelativeToTerrain enumerates the spatial relations of a city object relative to terrain in a qualitative way. Indicates that the city object is located entirely above the terrain. Indicates that the city object is for the most part located above the terrain. Indicates that the city object is located half above the terrain and half below the terrain. Indicates that the city object is for the most part located below the terrain. Indicates that the city object is located entirely below the terrain. RelativeToWater enumerates the spatial relations of a city object relative to the water surface in a qualitative way. Indicates that the city object is located entirely above the water surface. Indicates that the city object is for the most part located above the water surface. Indicates that the city object is located half above the water surface and half below the water surface. Indicates that the city object is for the most part located below the water surface. Indicates that the city object is located entirely below the water surface. Indicates that the city object is temporarily located above or below the water level, because the height of the water surface is varying. SpaceType is an enumeration that characterises a space according to its closure properties. Indicates that the space has boundaries at the bottom, at the top, and on all sides. Indicates that the space has at maximum a boundary at the bottom. Indicates that the space has a boundary at the bottom and on at least one side. TransformationMatrix2x2 is a 2 by 2 matrix represented as a list of four double values in row major order. TransformationMatrix3x4 is a 3 by 4 matrix represented as a list of twelve double values in row major order. TransformationMatrix4x4 is a 4 by 4 matrix represented as a list of sixteen double values in row major order.