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DDMSence (pronounced "dee-dee-em-Essence") is the only open-source Java library that fully supports the
DoD Discovery Metadata Specification (DDMS).
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A collection of location instances.
A collection-type intended for use as a generic container of location instances.
A spatial reference system using geographic identifiers. It is comprised of one or more location types (which may
be related). Each location instance is uniquely identified by means of a geographic identifier. [ISO 19112:2003 Clause 7.1] For example, countries as defined in ISO 3166-1 or named population centres in a region.
A spatial reference system using geographic identifiers type. A spatial reference system using geographic identifiers is comprised of a related set of one or more location types, together with their corresponding geographic identifiers. These location types may be related to each other through aggregation or disaggregation, possibly forming a hierarchy. [ISO 19112:2003 Clause 6.2] For example, countries as defined in ISO 3166-1 or named population centres in a region.
The name of a spatial reference system using geographic identifiers.
The geographic area within which the reference system occurs.
A characterization of the basis for the spatial reference system. For example: 'administration', 'electoral', and 'postal'.
Authority with overall responsibility for the spatial reference system.
iso19112:SI_LocationType
The location type in the spatial reference system.
A location type in a spatial reference system. A location type specifies the nature of the location that is specified by a location instance. For example, a "county", a "town", a "property", or a "river".
A location type type in a spatial reference system.
The name of the location type.
A method of uniquely identifying location instances. For example, 'name' or 'code'.
The way in which location instances are defined. The definition of the location type shall be in the form of one of the following:
- an area, defined by a set of boundaries, for example countries defined by their borders;
- a single feature, for example a street defined by its centre line, or a junction of two such streets;
- a collection of smaller features, for example trade areas defined by groups of countries.
Where a location type is defined as a collection of smaller units, an instance of that location need not have a well-defined boundary, for
example a postal code defined as a collection of postal delivery points.
The geographic area within which the location type occurs. For example, in the case of a gazetteer of "rivers" then the extent of North America.
The name of the organization or class of organization that is able to create and destroy location instances.
iso19112:SI_LocationType
A parent location type (a location type of which this location type is a subdivision). Parent and child location types are linked to the location type by the nesting association.
iso19112:SI_LocationType
A child location type (a location type which subdivides this location type). Parent and child location types are linked to the location type by the nesting association.
A gazetteer is a directory of geographic identifiers describing location instances. It will contain additional information regarding the position of each location instance. It may include a coordinate reference, but it may also be purely descriptive. If it contains a coordinate reference, this will enable transformation from the spatial reference system using geographic identifiers to the coordinate reference system. If it contains a descriptive reference, this will be a spatial reference using a different spatial reference system with geographic identifiers, for example the postcode of a property. For any location type, there may be more than one gazetteer.
A gazetteer type; a gazetteer is a directory of geographic identifiers describing location instances.
The name of the gazetteer, including its version date. A new version of the gazetteer shall be created whenever any location instance is created or destroyed, or a new version of a location instance is created.
A description of the location types contained in the gazetteer. For example, the "rivers of North America" or the "streets of London".
The geographic domain covered by the gazetteer. For example, for a gazetteer of rivers the extent of North America, or for a gazetteer of streets the extent of the City of London.
The organization responsible for maintenance of the gazetteer.
The coordinate reference system, if any, that is used in the gazetteer for describing position. The coordinate reference system provides a linking mechanism between referencing using geographic identifiers and referencing using coordinates.
iso19112:SI_LocationType
The location type for which instances are recorded in the gazetteer.
A location instance in a spatial reference system. A location instance specifies a location that is characterized by a location type. For example, a particular "county", "town", "property", or "river".
A location instance in a spatial reference system.
The unique geographic identifier for the location instance. In order to ensure that the geographic identifier is unique within a wider geographic domain, the geographic identifier may need to include an identifier of an instance of a parent location type, for example "Paris, Texas" (as distinguished from "Paris, France").
Optional additional geographic identifiers for the location instance.
The coordinates of a representative point for the location instance. An example of the position is the coordinates of the centroid of the location instance. This provides a linking mechanism to spatial referencing by coordinates.
A description of the location instance. The geographic extent shall be defined in one of the following ways:
- as a collection of smaller geographic features, for example the European Union, defined by its constituent countries;
- by a bounding polygon, described by either of the following:
-- as a closed set of boundary segments (each defined by one or more geographic features), for example a block defined
by the bounding streets;
-- by a set of coordinates, for example, a land parcel defined by the coordinates of its boundary.
The date of creation of this version of the location instance. The temporal extent will normally be the date of creation of this version of the gazetteer containing this location instance.
The name of organization responsible for defining the characteristics of the location instance.
Optional reference to the feature being identified by this location instance.
iso19112:SI_LocationInstance
A location instance of a different location type, for which this location instance is a sub-division.
iso19112:SI_LocationInstance
A location instance of a different location type, which subdivides this location instance.
iso19112:SI_LocationType
The location type of this location instance.
Optionally identifies partner organization that specified this geographic identifier, such as 'State of Montana'.
A unique geographic identifier for a location instance. In order to ensure that the geographic identifier is unique within a wider geographic domain, the geographic identifier may need to include an identifier of an instance of a parent location type, for example "Paris, Texas" (as distinguished from "Paris, France").
An identifier associated with the (e.g., name) geographic identifier.
Domain value describing if the alternativeGeographicIdentifier value (e.g, name) is, for example, an 'official' or 'variant'. For example, Canada has two official languages so there may be two official names; one English and one French.
Optionally, the date on which this geographic identifier (e.g., a name) was determined.
Identifies whether this geographic identifier (e.g., a name) is considered to be primary for the location instance.
Optional bibliographic reference citation codes (e.g., in the case that this geographic identifier is a "name").