Difference between revisions of "DMF Metadata Elements"
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Revision as of 06:55, 20 October 2017
Contents
DMF metadata elements
General
Viewpoints
The DGIWG Metadata Vision defines a general metadata use case involving metadata elements in four different contexts (i.e. use case scenarios):
- Discovery concerns the most important metadata elements, i.e. the metadata elements involved when a user needs to discover existing resources;
- Evaluation concerns the metadata elements needed to understand whether the discovered resources meet the user requirements;
- Use concerns the metadata elements needed to access and use the resource;
- Management concerns the metadata elements needed to manage the existing resources.
A candidate Metadata Catalogue shall take into account the DMF metadata element viewpoints in the interactions with the users (user interface, sets of metadata elements provided to the users in a given context).
Metadata element sets
The DMF metadata elements document different aspects of the resources including their identification, the related quality information, the spatial representation and the content description of the resource data. Each aspect is dealt with by the definition of an identified element set grouping the metadata elements covering the documentation of the aspect.
This grouping mechanism is important for the users especially when the number of metadata elements to be considered becomes high.# A candidate Metadata Catalogue shall take into account the DMF metadata element sets in the interactions with the users.
Metadata classes
The DGIWG Metadata Foundation defines several metadata classes:
* DMF/Core defines the minimum set of metadata elements to be implemented by any metadata catalogue. This set satisfies the discovery use case.
- DMF/Common is an additional set of metadata elements for a more complete description of any type of resource supported by DMF. It extends DMF/Core and covers discovery and basic evaluation use cases.
- DMF/Services extends DMF/Core for service metadata and can be used together with DMF/Common (i.e. it is possible to use DMF/Services on top of DMF/Core (if DMF/Common elements are not needed) or on top of DMF/Common for an extensive profile).
- DMF/Data extends DMF/Common for data related resources (i.e. dataset, series and tile). DMF/Data adds metadata elements for evaluation and use.
- DMF/Data+ extends DMF/Data for the implementation of coverage quality results and other metadata elements introduced in ISO 19115-2 but having some applications for any geospatial product.
- A DMF/Sensor class extending DMF/Data for sensors.
- DMF/Defence extends DMF/Core or DMF/Common for military oriented needs including NATO needs (extensions defined in NGMP, particularly security). It is needed to handle metadata to be exchanged with NATO in conformance with NGMP. DMF/Defence can be implemented with DMF/Core and possibly any other metadata class.
- DMF/Specific is an extension of the ISO metadata standards for high level military implementation of the DMF metadata elements.
- The documentation of a candidate Metadata Catalogue shall list the supported DMF metadata classes as defined in clause 5.1.3of this document.
- A candidate Metadata Catalogue shall support at least the DMF/Core.
- A candidate Metadata Catalogue having an output facility shall propose a mechanism to output a DMF Metadata Set conforming to one of the supported DMF metadata classes.
- A candidate profile of the DMF shall define the profiled DMF metadata classes. It shall respect the rules for profiling a DMF metadata class defined in Annex A.
- A candidate profile of the DMF can define one or more metadata class extending the DMF. It shall respect the rules for extending DMF defined in Annex A.
Metadata element requirements
Each DMF metadata element pertains to one metadata class. Each metadata element of the DMF has:*A unique Identifier introduced for consistency of the documentation;
- A Title serving as a human-oriented comprehensive identifier;
- An indication of the related metadata class;
- A Description statement which may include the expression of constraints (preceded by “Constraints:”) applicable to the metadata element;
- A Value Domain defining the applicable data types and vocabularies, as well as the applicable restrictions of the domain of values. Individual values are expressed in bold.
- A Cardinality statement.
Each basic type and vocabulary also pertains to one metadata class. Some data types are complex, i.e. they comprise of a set of properties also having an identifier, a title, a description, an indication of the related metadata class, a value domain and a cardinality. A complex data type implicitly pertains to the metadata classes defined for its properties (i.e. the complex type properties may relate to different metadata classes).
The cardinality statement may be expressed as:* a number of occurrences (typically 1 indicates that one and only one occurrence is expected), or;
- a range expressing a minimum and maximum number of occurrences. The format of a range of occurrences is n…m where:
- n is a positive integer or 0 indicating that the field is optional, i.e. it may not occur on any resource;
- m is a positive integer or * indicating that the maximum is unbounded.
Within a DMF Metadata Set describing a dataset, dataset series, service, tile, or nonGeographicDataset, each metadata element of the supported metadata classes shall occur as many times as specified by the cardinality and constraint statements.
- Within a DMF Metadata Set describing a dataset, dataset series, service, tile, or nonGeographicDataset, each instance of a property or metadata element having a complex data type shall comprise the property instances applicable to the supported metadata classes according to the data type definition.
- The content of each occurrence of a DMF Metadata Set shall conform to the value domain (including the data type definition) and description (including the identified constraints) of the metadata element.
- A candidate Metadata Catalogue shall be able to manage each of the metadata elements, data types and complex data type properties pertaining to the supported metadata classes, whether it is optional or not.
Reciprocally, a mandatory metadata element (i.e., its minimum occurrence is set to 1 or more) does not have to be implemented by a metadata catalogue if it is not part of the supported metadata classes.
A candidate Metadata Catalogue shall at least be able to ingest and/or output DMF Conformant Metadata Sets, depending on the user requirements.
The constraints applicable to DMF profiles with respect to the cardinality of the metadata elements are part of the rules for profiling defined in Annex A.
The following documentation of the DMF metadata elements is composed of:* The overview of the DMF metadata elements (see clause 5.2) which expresses the identifier, the title, the metadata class and the cardinality statement of the DMF Metadata Elements. It also organizes the metadata elements into four different viewpoints
- The detailed description of the DMF metadata elements organised by metadata element sets (see clause Error: Reference source not found).
Metadata Element Overview
For a detailed description of the metadata elements see clause 5.3.
| Identifier | Title | Card | Metadata Class | Viewpoints | |||
|---|---|---|---|---|---|---|---|
| D | E | U | M | ||||
| MDSID | Metadata Set Identifier | 0..1 | DMF/Core | X | |||
| MDLINK | Metadata Linkage | 0..1 | DMF/Specific | X | |||
| MDPTMD | Parent Metadata Set | 0..1 | DMF/Common | X | |||
| MDDLOC | Metadata Default Locale | 1 | DMF/Core | X | X | X | |
| MDTLOC | Metadata Translation | 0..* | DMF/Common | X | X | ||
| MDRPTY | Metadata Responsible Party | 1..* | DMF/Core | X | X | X | X |
| MDDATE | Metadata Date Stamp | 1 | DMF/Core | X | X | X | X |
| MDSTD | Metadata Standard | 1 | DMF/Core | X | X | X | |
| MDSCST | Metadata Security Constraint | 0..* | DMF/Common | X | X | X | X |
| MDREL | Metadata Releasability Addressee | 0..* | DMF/Defence | X | X | X | X |
| MDLCST | Metadata Legal Constraint | 0..* | DMF/Common | X | X | X | |
| MDMFRQ | Metadata Maintenance Frequency | 0..1 | DMF/Common | X | X | X | |
| RSTITLE | Resource Title | 1 | DMF/Core | X | X | X | X |
| RSALT | Resource Alternate Title | 0..1 | DMF/Common | X | X | X | |
| RSABSTR | Resource Abstract | 1 | DMF/Core | X | X | X | X |
| RSPURP | Resource Purpose | 0..1 | DMF/Core | X | X | X | X |
| RSTYPE | Resource Type Code | 1 | DMF/Core | X | X | X | X |
| RSTYPN | Resource Type Name | 0..1 | DMF/Core | X | X | X | X |
| RSED | Resource Edition | 0..1 | DMF/Core | X | X | X | |
| RSEDDAT | Resource Edition Date | 0..1 | DMF/Core | X | X | X | |
| RSID | Resource Identifier | 0..* | DMF/Core | X | X | X | X |
| RSKWDS | Resource Keyword Set | 0..* | DMF/Core | X | X | X | X |
| THUMB | Resource Thumbnail | 0..1 | DMF/Core | X | X | X | X |
| GPHICS | Resource Graphics | 0..* | DMF/Common | X | X | X | |
| RSSRES | Resource Spatial Resolution | 0..* | DMF/Core | X | X | X | X |
| RSTRES | Resource Temporal Resolution | 0..* | DMF/Common | X | X | X | |
| RSRPTP | Resource Spatial Representation Type | 0..1 | DMF/Core | X | X | X | X |
| RSTOPIC | Resource Topic Category | 0..* | DMF/Core | X | X | X | X |
| RSDLOC | Resource Default Locale | 1 | DMF/Core | X | X | X | |
| RSTLOC | Resource Other Locale | 0..* | DMF/Core | X | X | X | |
| DGITYP | Geospatial Information Type | 0..1 | DMF/Core | X | X | X | X |
| RSGFLV | Resource Georeferencing Level | 0..1 | DMF/Core | X | X | X | X |
| RSPREF | Resource Representation Form | 0..1 | DMF/Core | X | X | X | X |
| RSDTLVL | Resource Data Level | 0..1 | DMF/Defence | X | X | X | X |
| RSTHEME | Resource Theme | 0..* | DMF/Core | X | X | X | X |
| RSSERI | Name of Resource Series | 0..1 | DMF/Core | X | X | X | X |
| RSSHNA | Resource Sheet Name | 0..1 | DMF/Core | X | X | X | X |
| RSENVD | Resource Environment Description | 0..1 | DMF/Data | X | X | ||
| RSREM | Resource Remark | 0..1 | DMF/Common | X | X | X | X |
| RSFMT | Resource Format | 0..1 | DMF/Data | X | X | X | |
| SRTYPE | Service Type | 1 | DMF/Services | X | X | X | X |
| SRTVER | Service Type Version | 1 | DMF/Services | X | X | X | X |
| SRSTD | Service Standard | 0..1 | DMF/Services | X | X | X | |
| SRCPLING | Service Coupling Type | 1 | DMF/Services | X | X | X | |
| SROPRS | Resource Operated by the Service | 0..* | DMF/Services | X | X | X | |
| SROPER | Service Operation | 1..* | DMF/Services | X | X | X | |
| SRCORS | Service Coupled Resource | 0..* | DMF/Services | X | X | ||
| RCGRSPREP | Spatial Representation of a Georectified Gridded Coverage | 0..1 | DMF/Data | X | X | ||
| RFGRSPREP | Spatial Representation of a Georeferenceable Gridded Coverage | 0..1 | DMF/Sensor | X | X | ||
| GRCINF | Content Information of the Coverage | 0..1 | DMF/Data+ | X | X | ||
| ASSOC | Image Association Type | 0..1 | DMF/Sensor | X | X | X | |
| SPECTMOD | Spectral Mode | 0..1 | DMF/Sensor | X | X | X | |
| VCTOLVL | Topology Level | 0..1 | DMF/Data | X | X | ||
| VGEOM | Geometric Object | 0..* | DMF/Data | X | X | ||
| FCDESC | Feature Catalogue Description | 0..1 | DMF/Data | X | X | ||
| RSEXT | Resource Extent | 0..* | DMF/Core | X | X | X | X |
| RSRSYS | Resource Reference System | 0..* | DMF/Core | X | X | ||
| RSSTAT | Resource Status | 0..1 | DMF/Common | X | |||
| RSDATE | Resource Reference Date | 1..* | DMF/Core | X | X | X | X |
| RSRPTY | Resource Responsible Party | 0..* | DMF/Core | X | X | X | |
| RSMTNC | Resource Maintenance | 0..1 | DMF/Common | X | X | X | |
| RSSCST | Resource Security Constraint | 0..* | DMF/Core | X | X | X | X |
| RSREL | Resource Releasability | 0..* | DMF/Defence | X | X | X | X |
| RSUSE | Resource Use Limitation | 0..* | DMF/Core | X | X | X | |
| RSLCST | Resource Legal Constraint | 0..* | DMF/Core | X | X | X | |
| RSLING | Resource Lineage | 1 | DMF/Core | X | X | X | X |
| RSRQR | Resource Regulated Quality Report | 0..* | DMF/Common | X | X | X | |
| RSUQR | Resource Unspecified Quality Report | 0..* | DMF/Common | X | X | X | |
| RSSRC | Source of the Resource | 0..* | DMF/Common | X | X | X | |
| RSPRST | Resource Process Step | 0..* | DMF/Common | X | X | X | |
| RSSPUS | Resource Usage | 0..* | DMF/Common | X | X | ||
| RSDFMT | Resource Distribution Format | 1..* | DMF/Core | X | X | X | X |
| RSONLLC | Resource Online Location | 0..* | DMF/Core | X | X | X | |
| RSUD | Resource Unit of Distribution | 0..1 | DMF/Data | X | X | ||
| RSTS | Resource Transfer Size | 0..1 | DMF/Data | X | X | ||
| RSOFDM | Resource Offline Distribution Medium | 0..* | DMF/Data | X | X | ||
| ACINS | Acquisition Instrument | 1..* | DMF/Sensor | X | X | X | X |
| ACPLAT | Acquisition Platform Information | 0..1 | DMF/Sensor | X | X | X | |
| ACMETCD | Meteorological Conditions of Acquisition | 0..1 | DMF/Sensor | X | X | ||
| ACDATE | Acquisition Date Time | 0..1 | DMF/Sensor | X | X | X | X |
| SUNAZ | Sun Azimuth | 0..1 | DMF/Sensor | X | X | X | |
| SUNEL | Sun Elevation | 0..1 | DMF/Sensor | X | X | X
|
