| AbsoluteExternalPositionalAccuracy | 
 Closeness of reported coordinate values to values accepted as or being true. 
 | 
| AccuracyOfATimeMeasurement | 
 Correctness of the temporal references of an item (reporting of error in time measurement). 
 | 
| AcquisitionInformation | 
 Designations for the measuring instruments, the platform carrying them, and the mission to
 which the data contributes. 
 | 
| Address | 
 Location of the responsible individual or organization. 
 | 
| AffineCS | 
 A 2- or 3-dimensional coordinate system with straight axes that are not necessarily orthogonal. 
 | 
| AggregateInformation | 
Deprecated.
 | 
| Algorithm | 
 Details of the methodology by which geographic information was derived from the instrument
 readings. 
 | 
| ApplicationSchemaInformation | 
 Defines and exposes the structure of a resource (model and/or data dictionary). 
 | 
| AssociatedResource | 
 Associated resource information. 
 | 
| AssociationType | 
 Justification for the correlation of two datasets. 
 | 
| Attribute<V> | 
An instance of an  AttributeType containing the value of an attribute in a feature.  
 | 
| AttributeGroup | 
Information about content type for groups of attributes for a specific  RangeDimension.  
 | 
| AttributeType<V> | 
 Definition of an attribute in a feature type. 
 | 
| AttributeType | 
 | 
| AuthorityFactory | 
 Base interface for all authority factories. 
 | 
| AxisDirection | 
 The direction of positive increase in the coordinate value for a coordinate system axis. 
 | 
| Band | 
 Range of wavelengths in the electromagnetic spectrum. 
 | 
| BandDefinition | 
 Designation of criterion for defining maximum and minimum wavelengths for a spectral band. 
 | 
| BoundingPolygon | 
 Enclosing geometric object which locates the resource. 
 | 
| BrowseGraphic | 
 Graphic that provides an illustration of the dataset (including a legend for the graphic, if applicable). 
 | 
| CartesianCS | 
 A 2- or 3-dimensional coordinate system with orthogonal straight axes. 
 | 
| CellGeometry | 
 Code indicating whether grid data is point or area. 
 | 
| CharacterSet | 
Deprecated.
 | 
| Citation | 
 Standardized resource reference. 
 | 
| CitationDate | 
 Reference date and event used to describe it. 
 | 
| Classification | 
 Name of the handling restrictions on the dataset. 
 | 
| Classifier | 
 An annotation specifying the stereotype (abstract, datatype, union, etc.) of an interface. 
 | 
| CodeList<E extends CodeList<E>> | 
 Base class for all code lists. 
 | 
| CodeList.Filter | 
Deprecated.
 | 
| Completeness | 
 Presence and absence of features, their attributes and their relationships. 
 | 
| CompletenessCommission | 
 Excess data present in the dataset, as described by the scope. 
 | 
| CompletenessOmission | 
 Data absent from the dataset, as described by the scope. 
 | 
| ComplianceLevel | 
Deprecated.
 | 
| CompoundCRS | 
 A coordinate reference system describing the position of points through two or more
 independent coordinate reference systems. 
 | 
| ConcatenatedOperation | 
 An ordered sequence of two or more single coordinate operations. 
 | 
| ConceptualConsistency | 
 Adherence to rules of the conceptual schema. 
 | 
| ConformanceResult | 
 Information about the outcome of evaluating the obtained value (or set of values) against
 a specified acceptable conformance quality level. 
 | 
| ConicProjection | 
 Base interface for conical map projections. 
 | 
| Constraints | 
 Restrictions on the access and use of a resource or metadata. 
 | 
| Contact | 
 Information required to enable contact with the responsible person and/or organization. 
 | 
| ContentInformation | 
 Description of the content of a resource. 
 | 
| Context | 
 Designation of criterion for defining the context of the scanning process event. 
 | 
| ControlledVocabulary | 
 | 
| Conversion | 
 An operation on coordinates that does not include any change of Datum. 
 | 
| CoordinateOperation | 
 A mathematical operation on coordinates that transforms or converts coordinates to
 another coordinate reference system. 
 | 
| CoordinateOperationAuthorityFactory | 
 Creates coordinate transformation objects from codes. 
 | 
| CoordinateOperationFactory | 
 | 
| CoordinateReferenceSystem | 
 Base type of all Coordinate Reference Systems (CRS). 
 | 
| CoordinateSystem | 
 The set of coordinate system axes that spans a given coordinate space. 
 | 
| CoordinateSystemAxis | 
 Definition of a coordinate system axis. 
 | 
| CoupledResource | 
Links a given operation name (mandatory attribute of  OperationMetadata)
 with a resource identified by an "identifier".  
 | 
| CouplingType | 
 Class of information to which the referencing entity applies. 
 | 
| CoverageContentType | 
 Specific type of information represented in the cell. 
 | 
| CoverageDescription | 
 Information about the content of a grid data cell. 
 | 
| CoverageResult | 
 Result of a data quality measure organising the measured values as a coverage. 
 | 
| CRSAuthorityFactory | 
 | 
| CRSFactory | 
 | 
| CSAuthorityFactory | 
 | 
| CSFactory | 
 | 
| CylindricalCS | 
A 3-dimensional coordinate system consisting of a  PolarCS extended by a straight axis perpendicular
 to the plane spanned by the polar CS.  
 | 
| CylindricalProjection | 
 Base interface for cylindrical map projections. 
 | 
| DataFile | 
 Description of a transfer data file. 
 | 
| DataIdentification | 
 Information required to identify a resource. 
 | 
| DataQuality | 
 Quality information for the data specified by a data quality scope. 
 | 
| Datatype | 
 Datatype of element or entity. 
 | 
| DateType | 
 Identification of when a given event occurred 
 | 
| Datum | 
 | 
| DatumAuthorityFactory | 
Creates  datum objects using authority codes.  
 | 
| DatumFactory | 
Builds up complex  datums from simpler objects or values.  
 | 
| DerivedCRS | 
 A coordinate reference system that is defined by its coordinate conversion from another CRS
 but is not a projected CRS. 
 | 
| DigitalTransferOptions | 
 Technical means and media by which a resource is obtained from the distributor. 
 | 
| Dimension | 
 Axis properties. 
 | 
| DimensionNameType | 
 Name of the dimension. 
 | 
| DirectPosition | 
 Holds the coordinates for a position within some coordinate reference system. 
 | 
| DistributedComputingPlatform | 
 Distributed computing platform (DCP) on which an operation has been implemented. 
 | 
| Distribution | 
 Information about the distributor of and options for obtaining the resource. 
 | 
| Distributor | 
 Information about the distributor. 
 | 
| DomainConsistency | 
 Adherence of values to the value domains. 
 | 
| Duration | 
Temporary placeholder for an interface defined in the
  geoapi-pending module.  
 | 
| DynamicAttribute<V> | 
 | 
| DynamicAttributeType<V> | 
 Definition of a dynamic attribute in a moving feature type. 
 | 
| Element | 
 Type of test applied to the data specified by a data quality scope. 
 | 
| Ellipsoid | 
 Geometric figure that can be used to describe the approximate shape of the earth. 
 | 
| EllipsoidalCS | 
 A 2- or 3-dimensional coordinate system in which position is specified by
 geodetic latitude, geodetic longitude, and (in the 3D case) ellipsoidal height. 
 | 
| EngineeringCRS | 
 A 1-, 2- or 3-dimensional contextually local coordinate reference system. 
 | 
| EngineeringDatum | 
 Defines the origin of an engineering coordinate reference system. 
 | 
| Envelope | 
 A minimum bounding box or rectangle. 
 | 
| EnvironmentalRecord | 
 Information about the environmental conditions during the acquisition. 
 | 
| EvaluationMethodType | 
 Type of method for evaluating an identified data quality measure. 
 | 
| Event | 
 Identification of a significant collection point within an operation. 
 | 
| ExtendedElementInformation | 
 New metadata element, not found in ISO 19115, which is required to describe geographic data. 
 | 
| Extent | 
 Information about spatial, vertical, and temporal extent of the resource. 
 | 
| Factory | 
 Base interface for all factories. 
 | 
| FactoryException | 
Thrown when a  factory can not create an instance of the requested object.  
 | 
| Feature | 
An instance of a  FeatureType containing values for a real-world phenomena.  
 | 
| FeatureAssociation | 
 | 
| FeatureAssociationRole | 
 Indicates the role played by the association between two features. 
 | 
| FeatureCatalogueDescription | 
 Information identifying the feature catalogue or the conceptual schema. 
 | 
| FeatureInstantiationException | 
 | 
| FeatureOperationException | 
 | 
| FeatureType | 
 Abstraction of a real-world phenomena. 
 | 
| FeatureType | 
 | 
| FeatureTypeInfo | 
 Information about the occurring feature type. 
 | 
| FeatureTypeList | 
Deprecated.
 | 
| Format | 
 Description of the computer language construct that specifies the representation
 of data objects in a record, file, message, storage device or transmission channel. 
 | 
| FormatConsistency | 
 Degree to which data is stored in accordance with the physical structure of
 the dataset, as described by the scope. 
 | 
| Formula | 
 Specification of the coordinate operation method formula. 
 | 
| GCP | 
 Information on ground control point. 
 | 
| GCPCollection | 
 Information about a control point collection. 
 | 
| GeneralDerivedCRS | 
A coordinate reference system that is defined by its coordinate
  conversion from another coordinate reference system.  
 | 
| GeneralParameterDescriptor | 
 Abstract definition of a parameter or group of parameters used by an operation method. 
 | 
| GeneralParameterValue | 
 Abstract parameter value or group of parameter values. 
 | 
| GenericName | 
A sequence of identifiers rooted within the context of a  namespace.  
 | 
| GeocentricCRS | 
 A 3-dimensional coordinate reference system with the origin at the approximate centre of mass of the earth. 
 | 
| GeodeticCRS | 
 A 2- or 3-dimensional coordinate reference system associated with a geodetic datum. 
 | 
| GeodeticDatum | 
 Defines the location and precise orientation in 3-dimensional space of a defined ellipsoid
 (or sphere) that approximates the shape of the earth. 
 | 
| GeographicBoundingBox | 
 Geographic position of the resource. 
 | 
| GeographicCRS | 
 A 2- or 3-dimensional coordinate reference system based on an ellipsoidal approximation of the geoid. 
 | 
| GeographicDescription | 
 Description of the geographic area using identifiers. 
 | 
| GeographicExtent | 
 Base interface for geographic area of the resource. 
 | 
| GeolocationInformation | 
 Information used to determine geographic location corresponding to image location. 
 | 
| GeometricObjects | 
 Number of objects, listed by geometric object type, used in the dataset. 
 | 
| GeometricObjectType | 
 Name of point and vector spatial objects used to locate zero-, one-, and two-dimensional
 spatial locations in the dataset. 
 | 
| Geometry | 
Temporary placeholder for an interface defined in the
  geoapi-pending module.  
 | 
| GeometryType | 
 Geometric description of the collection. 
 | 
| Georectified | 
 Grid whose cells are regularly spaced in a geographic or projected coordinate reference system. 
 | 
| Georeferenceable | 
 Grid with cells irregularly spaced in any given geographic/projected coordinate reference system. 
 | 
| GriddedDataPositionalAccuracy | 
 Closeness of gridded data position values to values accepted as or being true. 
 | 
| GridSpatialRepresentation | 
 Basic information required to uniquely identify a resource or resources. 
 | 
| Identification | 
 Basic information required to uniquely identify a resource or resources. 
 | 
| IdentifiedObject | 
 Identification and remarks information for a reference system or CRS-related object. 
 | 
| IdentifiedType | 
 Identification and description information inherited by property types and feature types. 
 | 
| Identifier | 
 Value uniquely identifying an object within a namespace. 
 | 
| ImageCRS | 
 A 2-dimensional engineering coordinate reference system applied to locations in images. 
 | 
| ImageDatum | 
 Defines the origin of an image coordinate reference system. 
 | 
| ImageDescription | 
 Information about an image's suitability for use. 
 | 
| ImagingCondition | 
 Code which indicates conditions which may affect the image. 
 | 
| Individual | 
 Information about the party if the party is an individual. 
 | 
| InitiativeType | 
 Type of aggregation activity in which datasets are related 
 | 
| Instrument | 
 Designations for the measuring instruments. 
 | 
| InternationalString | 
 | 
| InvalidParameterCardinalityException | 
Thrown if adding or removing a  parameter value in a
  group would result in more or less parameters than the expected range.  
 | 
| InvalidParameterNameException | 
 | 
| InvalidParameterTypeException | 
Thrown by  ParameterValue getter methods when a value can not be casted to the
 requested type.  
 | 
| InvalidParameterValueException | 
Thrown by  ParameterValue setter methods when they are given an invalid value.  
 | 
| InvalidPropertyValueException | 
 | 
| KeywordClass | 
 Specification of a class to categorize keywords in a domain-specific
 vocabulary that has a binding to a formal ontology. 
 | 
| Keywords | 
 Keywords, their type and reference source. 
 | 
| KeywordType | 
 Methods used to group similar keywords. 
 | 
| LegalConstraints | 
 Restrictions and legal prerequisites for accessing and using the resource. 
 | 
| Lineage | 
 Information about the events or source data used in constructing the data specified by
 the scope or lack of knowledge about lineage. 
 | 
| LinearCS | 
 A 1-dimensional coordinate system that consists of the points that lie on the single axis described. 
 | 
| LocalName | 
Identifier within a  name space for a local object.  
 | 
| LogicalConsistency | 
 Degree of adherence to logical rules of data structure, attribution and relationships. 
 | 
| MaintenanceFrequency | 
 Frequency with which modifications and deletions are made to the data after it is first produced. 
 | 
| MaintenanceInformation | 
 Information about the scope and frequency of updating. 
 | 
| MathTransform | 
 Transforms multi-dimensional coordinate points. 
 | 
| MathTransform1D | 
 Transforms one-dimensional coordinate points. 
 | 
| MathTransform2D | 
 Transforms two-dimensional coordinate points. 
 | 
| MathTransformFactory | 
 Low level factory for creating MathTransform instances. 
 | 
| Matrix | 
 A two dimensional array of numbers. 
 | 
| Medium | 
 Information about the media on which the resource can be stored or distributed. 
 | 
| MediumFormat | 
 Method used to write to the medium. 
 | 
| MediumName | 
Deprecated.
 | 
| MemberName | 
The name to identify a member of a  record.  
 | 
| Metadata | 
 Root entity which defines metadata about a resource or resources. 
 | 
| MetadataExtensionInformation | 
 Information describing metadata extensions. 
 | 
| MetadataScope | 
 Class of information to which the referencing entity applies. 
 | 
| MismatchedDimensionException | 
 Indicates that an operation cannot be completed properly because
 of a mismatch in the dimensions of an argument given to a method. 
 | 
| MismatchedFeatureException | 
 Indicates that an operation cannot be completed properly because
 of a mismatch in the attribute or feature type of operands. 
 | 
| MultiValuedPropertyException | 
 | 
| NameFactory | 
 | 
| NameSpace | 
A domain in which  names given by character strings are defined.  
 | 
| NominalResolution | 
 Distance between consistent parts of (centre, left side, right side) adjacent pixels. 
 | 
| NoninvertibleTransformException | 
 | 
| NonQuantitativeAttributeAccuracy | 
 Accuracy of non-quantitative attributes. 
 | 
| NoSuchAuthorityCodeException | 
 | 
| NoSuchIdentifierException | 
 Thrown when an identifier provided to a factory method can not be found. 
 | 
| ObjectFactory | 
 | 
| Objective | 
 Describes the characteristics, spatial and temporal extent of the intended object to be
 observed. 
 | 
| ObjectiveType | 
 Temporal persistence of collection objective. 
 | 
| Obligation | 
 Whether an element is mandatory, optional or have other obligation. 
 | 
| Obligation | 
 Obligation of the element or entity. 
 | 
| OnLineFunction | 
 Class of information to which the referencing entity applies. 
 | 
| OnlineResource | 
 Information about on-line sources from which the dataset, specification, or
 community profile name and extended metadata elements can be obtained. 
 | 
| Operation | 
 Describes the behaviour of a feature type as a function or a method. 
 | 
| Operation | 
 Designations for the operation used to acquire the dataset. 
 | 
| OperationChainMetadata | 
 Operation chain information. 
 | 
| OperationMetadata | 
 Describes the signature of one and only one method provided by the service. 
 | 
| OperationMethod | 
 Definition of an algorithm used to perform a coordinate operation. 
 | 
| OperationNotFoundException | 
 | 
| OperationType | 
 Code indicating whether the data contained in this packet is real (originates from live-fly
 or other non-simulated operational sources), simulated (originates from target simulator sources),
 or synthesized (a mix of real and simulated data). 
 | 
| Organisation | 
 Information about the party if the party is an organisation. 
 | 
| OutOfTemporalDomainException | 
Thrown when the temporal position given to a dynamic attribute  valuesAt
 method is outside the period of validity.  
 | 
| ParameterDescriptor<T> | 
 The definition of a parameter used by an operation method. 
 | 
| ParameterDescriptorGroup | 
 The definition of a group of related parameters used by an operation method. 
 | 
| ParameterDirection | 
 Class of information to which the referencing entity applies. 
 | 
| ParameterNotFoundException | 
Thrown by parameter groups
 ( value and  descriptor)
 when a parameter is requested but not found in that group.  
 | 
| ParameterValue<T> | 
 A single parameter value used by an operation method. 
 | 
| ParameterValueGroup | 
 A group of related parameter values. 
 | 
| ParametricCRS | 
 A 1-dimensional coordinate reference system which uses parameter values or functions. 
 | 
| ParametricCS | 
 A 1-dimensional coordinate system containing a single axis. 
 | 
| ParametricDatum | 
 A textual description and/or a set of parameters identifying a particular reference surface used as
 the origin of a parametric coordinate system, including its position with respect to the Earth. 
 | 
| Party | 
 Information about the individual and / or organisation of the party. 
 | 
| PassThroughOperation | 
 A pass-through operation specifies that a subset of a coordinate tuple is subject to a specific
 coordinate operation. 
 | 
| PeriodDuration | 
Temporary placeholder for an interface defined in the
  geoapi-pending module.  
 | 
| PixelInCell | 
 Specification of the way the image grid is associated with the image data attributes. 
 | 
| PixelOrientation | 
 Point in a pixel corresponding to the Earth location of the pixel. 
 | 
| Plan | 
 Designations for the planning information related to meeting the data acquisition requirements. 
 | 
| PlanarProjection | 
 Base interface for for azimuthal (or planar) map projections. 
 | 
| Platform | 
 Designation of the platform used to acquire the dataset. 
 | 
| PlatformPass | 
 Identification of collection coverage. 
 | 
| Point | 
Temporary placeholder for an interface defined in the
  geoapi-pending module.  
 | 
| PolarCS | 
 A 2-dimensional coordinate system in which position is specified by the distance from the
 origin and the angle between the line from the origin to a point and a reference direction. 
 | 
| PolarizationOrientation | 
 Polarization of the antenna relative to the waveform. 
 | 
| PortrayalCatalogueReference | 
 Information identifying the portrayal catalogue used. 
 | 
| Position | 
 | 
| PositionalAccuracy | 
 Accuracy of the position of features. 
 | 
| PresentationForm | 
 Mode in which the data is represented. 
 | 
| PrimeMeridian | 
 A prime meridian defines the origin from which longitude values are determined. 
 | 
| Priority | 
 Ordered list of priorities. 
 | 
| Processing | 
 Comprehensive information about the procedure(s), process(es) and algorithm(s) applied
 in the process step. 
 | 
| ProcessStep | 
 Information about an event or transformation in the life of resource. 
 | 
| ProcessStepReport | 
 Report of what occurred during the process step. 
 | 
| Profile | 
Deprecated.
 | 
| Progress | 
 Status of the dataset or progress of a review. 
 | 
| ProjectedCRS | 
 A 2-dimensional coordinate reference system used to approximate the shape of the earth on a planar surface. 
 | 
| Projection | 
A  conversion transforming
 ( longitude, latitude) coordinates to Cartesian coordinates
 ( x, y).  
 | 
| Property | 
 | 
| PropertyNotFoundException | 
 | 
| PropertyType | 
Characteristics that may be associated with a  FeatureType.  
 | 
| QuantitativeAttributeAccuracy | 
 Accuracy of quantitative attributes. 
 | 
| QuantitativeResult | 
 Information about the value (or set of values) obtained from applying a data quality measure. 
 | 
| RangeDimension | 
 Information on the range of each dimension of a cell measurement value. 
 | 
| RangeElementDescription | 
 Description of specific range elements. 
 | 
| RangeMeaning | 
 | 
| Record | 
 A list of logically related elements as (name, value) pairs in a dictionary. 
 | 
| RecordSchema | 
 | 
| RecordType | 
The type definition of a  record.  
 | 
| ReferenceIdentifier | 
 Identifier used for reference systems. 
 | 
| ReferenceSystem | 
 Description of a spatial and temporal reference system used by a dataset. 
 | 
| ReferenceSystemType | 
 Defines type of reference system used. 
 | 
| RelativeInternalPositionalAccuracy | 
 Closeness of the relative positions of features in the scope to their respective
 relative positions accepted as or being true. 
 | 
| Releasability | 
 Information about resource release constraints. 
 | 
| RepresentativeFraction | 
 A scale defined as the inverse of a denominator. 
 | 
| RequestedDate | 
 Range of date validity. 
 | 
| Requirement | 
 Requirement to be satisfied by the planned data acquisition. 
 | 
| Resolution | 
 Level of detail expressed as a scale factor or a ground distance. 
 | 
| Responsibility | 
 Information about the party and their role. 
 | 
| ResponsibleParty | 
Deprecated. | 
| Restriction | 
 Limitation(s) placed upon the access or use of the data. 
 | 
| Result | 
 Base interface of more specific result classes. 
 | 
| Role | 
 Function performed by the responsible party. 
 | 
| SampleDimension | 
 The characteristics of each dimension (layer) included in the resource. 
 | 
| Scope | 
 The target resource and physical extent for which information is reported. 
 | 
| Scope | 
 Description of the data specified by the scope. 
 | 
| ScopeCode | 
 Class of information to which the referencing entity applies. 
 | 
| ScopeDescription | 
 Description of the class of information covered by the information. 
 | 
| ScopedName | 
 A composite of a LocalName (as head) for locating another name space,
 and a GenericName (as tail) valid in that name space. 
 | 
| SecurityConstraints | 
 Handling restrictions imposed on the resource or metadata for national security or similar security concerns. 
 | 
| Sequence | 
 Temporal relation of activation. 
 | 
| Series | 
 Information about the series, or aggregate dataset, to which a dataset belongs. 
 | 
| ServiceIdentification | 
 Identification of capabilities which a service provider makes available. 
 | 
| SingleCRS | 
 | 
| SingleOperation | 
 A parameterized mathematical operation on coordinates that transforms or converts
 coordinates to another coordinate reference system. 
 | 
| Source | 
 Information about the resource used in creating the resource specified by the scope. 
 | 
| SpatialRepresentation | 
 Digital mechanism used to represent spatial information. 
 | 
| SpatialRepresentationType | 
 Method used to represent geographic information in the dataset. 
 | 
| SpatialTemporalExtent | 
 Extent with respect to date/time and spatial boundaries. 
 | 
| Specification | 
 ISO/OGC specifications from which an interface, method, enumeration or code list was derived. 
 | 
| SphericalCS | 
 A 3-dimensional coordinate system with one distance measured from the origin and two angular coordinates. 
 | 
| StandardOrderProcess | 
 Common ways in which the resource may be obtained or received, and related instructions
 and fee information. 
 | 
| Stereotype | 
 Type of modeling element as declared in the OGC/ISO UML diagram. 
 | 
| Telephone | 
 Telephone numbers for contacting the responsible individual or organization. 
 | 
| TelephoneType | 
 Type of telephone. 
 | 
| TemporalAccuracy | 
 Accuracy of the temporal attributes and temporal relationships of features. 
 | 
| TemporalConsistency | 
 Correctness of ordered events or sequences, if reported. 
 | 
| TemporalCRS | 
 A 1-dimensional coordinate reference system used for the recording of time. 
 | 
| TemporalDatum | 
 A temporal datum defines the origin of a temporal coordinate reference system. 
 | 
| TemporalExtent | 
 Time period covered by the content of the resource. 
 | 
| TemporalPosition | 
Temporary placeholder for an interface defined in the
  geoapi-pending module.  
 | 
| TemporalPrimitive | 
Temporary placeholder for an interface defined in the
  geoapi-pending module.  
 | 
| TemporalValidity | 
 Validity of data specified by the scope with respect to time. 
 | 
| ThematicAccuracy | 
 Accuracy of quantitative attributes and the correctness of non-quantitative attributes
 and of the classifications of features and their relationships. 
 | 
| ThematicClassificationCorrectness | 
 Comparison of the classes assigned to features or their attributes to a universe of discourse. 
 | 
| TimeCS | 
 A 1-dimensional coordinate system containing a single time axis. 
 | 
| TopicCategory | 
 High-level geographic data thematic classification to assist in the grouping and
 search of available geographic data sets. 
 | 
| TopologicalConsistency | 
 Correctness of the explicitly encoded topological characteristics of the dataset as
 described by the scope. 
 | 
| TopologyLevel | 
 Degree of complexity of the spatial relationships. 
 | 
| TransferFunctionType | 
 Transform function to be used when scaling a physical value for a given element. 
 | 
| Transformation | 
 An operation on coordinates that usually includes a change of Datum. 
 | 
| TransformException | 
 Common superclass for a number of transformation-related exceptions. 
 | 
| Trigger | 
 Mechanism of activation. 
 | 
| Type | 
 The type definition. 
 | 
| TypeName | 
 | 
| UML | 
 An annotation mapping each interface, methods or fields to the UML identifier where they come from. 
 | 
| Usability | 
Deprecated.
 | 
| Usage | 
 Brief description of ways in which the resource(s) is/are currently or has been used. 
 | 
| UserDefinedCS | 
 A 2- or 3-dimensional coordinate system that consists of any combination of axes not covered by any other CS type. 
 | 
| VectorSpatialRepresentation | 
 Information about the vector spatial objects in the dataset. 
 | 
| VerticalCRS | 
 A 1-dimensional coordinate reference system used for recording heights or depths. 
 | 
| VerticalCS | 
 A 1-dimensional coordinate system used to record the heights or depths of points. 
 | 
| VerticalDatum | 
 A textual description and/or a set of parameters identifying a particular reference level
 surface used as a zero-height surface. 
 | 
| VerticalDatumType | 
 Type of a vertical datum. 
 | 
| VerticalExtent | 
 Vertical domain of resource. 
 |