# Class AttributeNames

Object
AttributeNames

public class AttributeNames extends Object
Name of attributes used in the mapping from/to netCDF metadata to ISO 19115 metadata. The attributes recognized by SIS are listed below:

> List of all netCDF attributes mapped by Apache SIS to ISO 19115 metadata
> "acces_constraint" "acknowledgement" "comment" "contributor_email" "contributor_name" "contributor_role" "contributor_url" "creator_email" "creator_name" "creator_type" "creator_url" "cdm_data_type" "date_created" "date_issued" "date_metadata_modified" "date_modified" "flag_masks" "flag_meanings" "flag_names" "flag_values" "full_name" | "geographic_identifier" "geospatial_bounds" "geospatial_bounds_crs" "geospatial_bounds_vertical_crs" "geospatial_lat_max" "geospatial_lat_min" "geospatial_lat_resolution" "geospatial_lat_units" "geospatial_lon_max" "geospatial_lon_min" "geospatial_lon_resolution" "geospatial_lon_units" "geospatial_vertical_max" "geospatial_vertical_min" "geospatial_vertical_positive" "geospatial_vertical_resolution" "geospatial_vertical_units" "history" "id" "institution" | "keywords" "keywords_vocabulary" "license" "metadata_creation" "metadata_link" "name" "processing_level" "product_version" "program" "project" "publisher_email" "publisher_name" "publisher_type" "publisher_url" "purpose" "references" "source" "standard_name" "standard_name_vocabulary" "summary" | "time_coverage_duration" "time_coverage_end" "time_coverage_resolution" "time_coverage_start" "time_coverage_units" "title" "topic_category"

## References

- NetCDF Attribute Convention for Dataset Discovery wiki

Since:
  0.3

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `static class`
  `AttributeNames​.Dimension`
  Holds the attribute names describing a simple latitude, longitude, and vertical bounding box.
  `static class`
  `AttributeNames​.Responsible`
  Holds the attribute names describing a responsible party.
  `static class`
  `AttributeNames​.Term`
  Holds the attribute names describing a term together with a vocabulary (or naming authority).

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `ACCESS_CONSTRAINT`
  The "acces_constraint" attribute name for the access constraints applied to assure the protection of privacy or intellectual property.
  `static final String`
  `ACKNOWLEDGEMENT`
  The "acknowledgement" attribute name for a place to acknowledge various type of support for the project that produced this data (Recommended).
  `static final String`
  `COMMENT`
  The "comment" attribute name for miscellaneous information about the data (Recommended).
  `static final AttributeNames​.Responsible`
  `CONTRIBUTOR`
  The set of attribute names for the contributor (Suggested).
  `static final AttributeNames​.Responsible`
  `CREATOR`
  The set of attribute names for the creator (Recommended).
  `static final String`
  `DATA_TYPE`
  The "cdm_data_type" attribute name for the THREDDS data type appropriate for this dataset (Recommended).
  `static final String`
  `DATE_CREATED`
  The "date_created" attribute name for the date on which the data was created (Recommended).
  `static final String`
  `DATE_ISSUED`
  The "date_issued" attribute name for a date on which this data was formally issued (Suggested).
  `static final String`
  `DATE_MODIFIED`
  The "date_modified" attribute name for the date on which this data was last modified (Suggested).
  `static final String`
  `FLAG_MASKS`
  The "flag_masks" attribute name for bitmask to apply on sample values before to compare them to the flag values.
  `static final String`
  `FLAG_MEANINGS`
  The "flag_meanings" attribute name for the meaning of flag values.
  `static final String`
  `FLAG_NAMES`
  The "flag_names" attribute name for the designation associated with a range element.
  `static final String`
  `FLAG_VALUES`
  The "flag_values" attribute name for sample values to be flagged.
  `static final String`
  `GEOGRAPHIC_IDENTIFIER`
  The "geographic_identifier" attribute name for an identifier of the geographic area.
  `static final String`
  `GEOSPATIAL_BOUNDS`
  Data's 2D or 3D geospatial extent in OGC's Well-Known Text (WKT) geometry format.
  `static final String`
  `HISTORY`
  The "history" attribute name for providing an audit trail for modifications to the original data (Recommended).
  `static final AttributeNames​.Term`
  `IDENTIFIER`
  The set of attribute names for an identifier (Recommended).
  `static final AttributeNames​.Term`
  `INSTRUMENT`
  The set of attribute names for the contributing instrument(s) or sensor(s) used to create the resource(s).
  `static final AttributeNames​.Term`
  `KEYWORDS`
  The set of attribute names for a comma separated list of key words and phrases (Highly Recommended).
  `static final AttributeNames​.Dimension`
  `LATITUDE`
  The set of attribute names for the minimal and maximal latitudes of the bounding box, resolution and units.
  `static final String`
  `LICENSE`
  The "license" attribute name for a description of the restrictions to data access and distribution (Recommended).
  `static final AttributeNames​.Dimension`
  `LONGITUDE`
  The set of attribute names for the minimal and maximal longitudes of the bounding box, resolution and units.
  `static final String`
  `METADATA_CREATION`
  The "metadata_creation" attribute name for the date on which the metadata was created (Suggested).
  `static final String`
  `METADATA_LINK`
  The "metadata_link" attribute name for a URL that gives the location of more complete metadata.
  `static final String`
  `METADATA_MODIFIED`
  The "date_metadata_modified" attribute name for the date on which the metadata has been modified (Suggested).
  `static final AttributeNames​.Term`
  `PLATFORM`
  The set of attribute names for the platform(s) that supported the sensors used to create the resource(s).
  `static final String`
  `PROCESSING_LEVEL`
  The "processing_level" attribute name for a textual description of the processing (or quality control) level of the data.
  `static final String`
  `PRODUCT_VERSION`
  The "product_version" attribute for version identifier of the data file or product as assigned by the data creator (Suggested).
  `static final AttributeNames​.Term`
  `PROGRAM`
  The set of attribute names for the overarching program(s) of which the dataset is a part (Suggested).
  `static final String`
  `PROJECT`
  The "project" attribute name for the scientific project that produced the data (Recommended).
  `static final AttributeNames​.Responsible`
  `PUBLISHER`
  The set of attribute names for the publisher (Suggested).
  `static final String`
  `PURPOSE`
  The "purpose" attribute name for the summary of the intentions with which the resource(s) was developed.
  `static final String`
  `REFERENCES`
  The "references" attribute name for bibliographical references.
  `static final String`
  `SOURCE`
  The "source" attribute name for the method of production of the original data (Recommended).
  `static final AttributeNames​.Term`
  `STANDARD_NAME`
  The set of attribute names for a long descriptive name for the variable taken from a controlled vocabulary of variable names.
  `static final String`
  `SUMMARY`
  The "summary" attribute name for a paragraph describing the dataset (Highly Recommended).
  `static final AttributeNames​.Dimension`
  `TIME`
  The set of attribute names for the start and end times of the bounding box, resolution and units.
  `static final String`
  `TITLE`
  The "title" attribute name for a short description of the dataset (Highly Recommended).
  `static final String`
  `TOPIC_CATEGORY`
  The "topic_category" attribute name for a high-level geographic data thematic classification.
  `static final AttributeNames​.Dimension`
  `VERTICAL`
  The set of attribute names for the minimal and maximal elevations of the bounding box, resolution and units.

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `AttributeNames()`
  For subclass constructors only.

- ## Method Summary

  ### Methods inherited from class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### TITLE

    public static final String TITLE
    The "title" attribute name for a short description of the dataset (Highly Recommended). If no "title" attribute is provided, then `AttributeNames` will look for "full_name" and "name".

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `citation` / `title`
    See Also:
      - `NetcdfFile​.getTitle()`
      - ESIP reference
      - Constant Field Values

  - ### SUMMARY

    public static final String SUMMARY
    The "summary" attribute name for a paragraph describing the dataset (Highly Recommended).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `abstract`
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### IDENTIFIER

    public static final AttributeNames.Term IDENTIFIER
    The set of attribute names for an identifier (Recommended). The combination of the `"naming_authority"` and the `"id"` should be a globally unique identifier for the dataset.

    Path in ISO 19115:

    - `Metadata` / `fileIdentifier`
    - `Metadata` / `identificationInfo` / `citation` / `identifier` / `code`
    - `Metadata` / `identificationInfo` / `citation` / `identifier` / `authority` / `title`
    See Also:
      - `NetcdfFile​.getId()`
      - ESIP reference

  - ### STANDARD_NAME

    public static final AttributeNames.Term STANDARD_NAME
    The set of attribute names for a long descriptive name for the variable taken from a controlled vocabulary of variable names. This is actually a variable attribute, but sometimes appears also in global attributes.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `descriptiveKeywords` / `keyword` with `KeywordType​.THEME`
    - `Metadata` / `identificationInfo` / `descriptiveKeywords` / `thesaurusName` / `title`
    See Also:
      - `KEYWORDS`
      - ESIP reference

  - ### KEYWORDS

    public static final AttributeNames.Term KEYWORDS
    The set of attribute names for a comma separated list of key words and phrases (Highly Recommended).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `descriptiveKeywords` / `keyword` with `KeywordType​.THEME`
    - `Metadata` / `identificationInfo` / `descriptiveKeywords` / `thesaurusName` / `title`
    See Also:
      - `STANDARD_NAME`
      - ESIP reference

  - ### TOPIC_CATEGORY

    public static final String TOPIC_CATEGORY
    The "topic_category" attribute name for a high-level geographic data thematic classification. Typical values are `"farming"`, `"biota"`, `"boundaries"`, `"climatology meteorology atmosphere"`, `"economy"`, `"elevation"`, `"environment"`, `"geoscientific information"`, `"health"`, `"imagery base maps earth cover"`, `"intelligence military"`, `"inland waters"`, `"location"`, `"oceans"`, `"planning cadastre"`, `"society"`, `"structure"`, `"transportation"` and `"utilitiesCommunication"`.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `topicCategory`
    See Also:
      - `TopicCategory`
      - Constant Field Values

  - ### DATA_TYPE

    public static final String DATA_TYPE
    The "cdm_data_type" attribute name for the THREDDS data type appropriate for this dataset (Recommended). Examples: `"Vector"`, `"TextTable"`, `"Grid"`, `"Image"`, `"Video"`, `"Tin"`, `"StereoModel"`, `"Station"`, `"Swath"` or `"Trajectory"`.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `spatialRepresentationType`
    See Also:
      - `SpatialRepresentationType`
      - ESIP reference
      - Constant Field Values

  - ### HISTORY

    public static final String HISTORY
    The "history" attribute name for providing an audit trail for modifications to the original data (Recommended). This is a character array with a line for each invocation of a program that has modified the dataset.

    Path in ISO 19115:

    - `Metadata` / `resourceLineage` / `statement`

    #### Departure from convention

    Located in "`dataQualityInfo` / `lineage`" instead of "`resourceLineage`" in `UnidataDD2MI​.xsl` file (retrieved in 2017). See SIS-361.
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### SOURCE

    public static final String SOURCE
    The "source" attribute name for the method of production of the original data (Recommended).

    Path in ISO 19115:

    - `Metadata` / `resourceLineage` / `source` / `description`

    #### Departure from convention

    Located in "`dataQualityInfo` / `lineage`" instead of "`resourceLineage`" in `UnidataDD2MI​.xsl` file (retrieved in 2017). See SIS-361.
    Since:
      0.8
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### COMMENT

    public static final String COMMENT
    The "comment" attribute name for miscellaneous information about the data (Recommended).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `supplementalInformation`
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### METADATA_CREATION

    public static final String METADATA_CREATION
    The "metadata_creation" attribute name for the date on which the metadata was created (Suggested). This is actually defined in the "`NCISOMetadata`" subgroup.

    Path in ISO 19115:

    - `Metadata` / `dateInfo` `date` with `DateType​.CREATION`
    See Also:
      - Constant Field Values

  - ### METADATA_MODIFIED

    public static final String METADATA_MODIFIED
    The "date_metadata_modified" attribute name for the date on which the metadata has been modified (Suggested).

    Path in ISO 19115:

    - `Metadata` / `dateInfo` `date` with `DateType​.REVISION`
    Since:
      0.8
    See Also:
      - Constant Field Values

  - ### DATE_CREATED

    public static final String DATE_CREATED
    The "date_created" attribute name for the date on which the data was created (Recommended).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `citation` / `date` / `date` with `DateType​.CREATION`
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### DATE_MODIFIED

    public static final String DATE_MODIFIED
    The "date_modified" attribute name for the date on which this data was last modified (Suggested).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `citation` / `date` / `date` with `DateType​.REVISION`
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### DATE_ISSUED

    public static final String DATE_ISSUED
    The "date_issued" attribute name for a date on which this data was formally issued (Suggested).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `citation` / `date` / `date` with `DateType​.PUBLICATION`
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### PRODUCT_VERSION

    public static final String PRODUCT_VERSION
    The "product_version" attribute for version identifier of the data file or product as assigned by the data creator (Suggested).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `citation` / `edition`
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### PROGRAM

    public static final AttributeNames.Term PROGRAM
    The set of attribute names for the overarching program(s) of which the dataset is a part (Suggested). Examples: "GHRSST", "NOAA CDR", "NASA EOS", "JPSS", "GOES-R".

    Path in ISO 19115:

    - `Metadata` / `acquisitionInformation` / `operation` / `identifier` / `code`

    This attribute is not yet read by `NetcdfStore`, because we are not sure what would be the most appropriate ISO 19115 location. The above-cited location is experimental and may change in any future Apache SIS version.

    Since:
      0.8
    See Also:
      - `PROJECT`
      - ESIP reference

  - ### PLATFORM

    public static final AttributeNames.Term PLATFORM
    The set of attribute names for the platform(s) that supported the sensors used to create the resource(s).

    Path in ISO 19115:

    - `Metadata` / `acquisitionInformation` / `platform` / `identifier` / `code`
    - `Metadata` / `acquisitionInformation` / `platform` / `identifier` / `authority` / `title`
    Since:
      0.8

  - ### INSTRUMENT

    public static final AttributeNames.Term INSTRUMENT
    The set of attribute names for the contributing instrument(s) or sensor(s) used to create the resource(s).

    Path in ISO 19115:

    - `Metadata` / `acquisitionInformation` / `platform` / `instrument` / `identifier` / `code`
    - `Metadata` / `acquisitionInformation` / `platform` / `instrument` / `identifier` / `authority` / `title`
    Since:
      0.8

  - ### CREATOR

    public static final AttributeNames.Responsible CREATOR
    The set of attribute names for the creator (Recommended).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `citation` / `citedResponsibleParty` with `Role​.ORIGINATOR`
    See Also:
      - `CONTRIBUTOR`
      - `PUBLISHER`
      - ESIP reference

  - ### CONTRIBUTOR

    public static final AttributeNames.Responsible CONTRIBUTOR
    The set of attribute names for the contributor (Suggested).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `citation`
    See Also:
      - `CREATOR`
      - `PUBLISHER`
      - ESIP reference

  - ### PUBLISHER

    public static final AttributeNames.Responsible PUBLISHER
    The set of attribute names for the publisher (Suggested).

    Path in ISO 19115:

    - `Metadata` / `distributionInfo` / `distributors` / `distributorContact` with `Role​.PUBLISHER`
    - `Metadata` / `identificationInfo` / `descriptiveKeywords` / `keyword` with the `"dataCenter"` `KeywordType`
    See Also:
      - `CREATOR`
      - `CONTRIBUTOR`
      - ESIP reference

  - ### PROJECT

    public static final String PROJECT
    The "project" attribute name for the scientific project that produced the data (Recommended).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `descriptiveKeywords` / `keyword` with the `"project"` `KeywordType`
    See Also:
      - `PROGRAM`
      - ESIP reference
      - Constant Field Values

  - ### PURPOSE

    public static final String PURPOSE
    The "purpose" attribute name for the summary of the intentions with which the resource(s) was developed.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `purpose`
    See Also:
      - Constant Field Values

  - ### REFERENCES

    public static final String REFERENCES
    The "references" attribute name for bibliographical references.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `citation` / `otherCitationDetails`
    See Also:
      - Constant Field Values

  - ### PROCESSING_LEVEL

    public static final String PROCESSING_LEVEL
    The "processing_level" attribute name for a textual description of the processing (or quality control) level of the data.

    Path in ISO 19115:

    - `Metadata` / `contentInfo` / `processingLevelCode`
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### ACKNOWLEDGEMENT

    public static final String ACKNOWLEDGEMENT
    The "acknowledgement" attribute name for a place to acknowledge various type of support for the project that produced this data (Recommended).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `credit`
    Since:
      0.8
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### LICENSE

    public static final String LICENSE
    The "license" attribute name for a description of the restrictions to data access and distribution (Recommended).

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `resourceConstraints` / `useLimitation`
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### ACCESS_CONSTRAINT

    public static final String ACCESS_CONSTRAINT
    The "acces_constraint" attribute name for the access constraints applied to assure the protection of privacy or intellectual property. Typical values are `"copyright"`, `"patent"`, `"patent pending"`, `"trademark"`, `"license"`, `"intellectual property rights"` or `"restricted"`.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `resourceConstraints` / `accessConstraints`
    See Also:
      - `Restriction`
      - Constant Field Values

  - ### GEOGRAPHIC_IDENTIFIER

    public static final String GEOGRAPHIC_IDENTIFIER
    The "geographic_identifier" attribute name for an identifier of the geographic area.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `extent` / `geographicElement` / `geographicIdentifier`
    See Also:
      - Constant Field Values

  - ### GEOSPATIAL_BOUNDS

    public static final String GEOSPATIAL_BOUNDS
    Data's 2D or 3D geospatial extent in OGC's Well-Known Text (WKT) geometry format. The Coordinate Reference System is given by `"geospatial_bounds_crs"`, possibly completed by `"geospatial_bounds_vertical_crs"`.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `extent` / `geographicElement` / `polygon`
    Since:
      0.8
    See Also:
      - ESIP reference
      - Constant Field Values

  - ### LATITUDE

    public static final AttributeNames.Dimension LATITUDE
    The set of attribute names for the minimal and maximal latitudes of the bounding box, resolution and units. Latitudes are assumed to be in decimal degrees north, unless a units attribute is specified.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `extent` / `geographicElement` / `southBoundLatitude` or `northBoundLatitude`
    - `Metadata` / `spatialRepresentationInfo` / `axisDimensionProperties` / `resolution`
    See Also:
      - `LONGITUDE`
      - `VERTICAL`
      - `TIME`
      - ESIP reference

  - ### LONGITUDE

    public static final AttributeNames.Dimension LONGITUDE
    The set of attribute names for the minimal and maximal longitudes of the bounding box, resolution and units. Longitudes are assumed to be in decimal degrees east, unless a units attribute is specified.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `extent` / `geographicElement` / `westBoundLongitude` or `eastBoundLongitude`
    - `Metadata` / `spatialRepresentationInfo` / `axisDimensionProperties` / `resolution`
    See Also:
      - `LATITUDE`
      - `VERTICAL`
      - `TIME`
      - ESIP reference

  - ### VERTICAL

    public static final AttributeNames.Dimension VERTICAL
    The set of attribute names for the minimal and maximal elevations of the bounding box, resolution and units. Elevations are assumed to be in metres above the ground, unless a units attribute is specified.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `extent` / `verticalElement` / `minimumValue` or `maximumValue`
    - `Metadata` / `spatialRepresentationInfo` / `axisDimensionProperties` / `resolution`
    See Also:
      - `LATITUDE`
      - `LONGITUDE`
      - `TIME`
      - ESIP reference

  - ### TIME

    public static final AttributeNames.Dimension TIME
    The set of attribute names for the start and end times of the bounding box, resolution and units.

    Path in ISO 19115:

    - `Metadata` / `identificationInfo` / `extent` / `temporalElement` / `extent`
    - `Metadata` / `spatialRepresentationInfo` / `axisDimensionProperties` / `resolution`
    See Also:
      - `LATITUDE`
      - `LONGITUDE`
      - `VERTICAL`
      - ESIP reference

  - ### FLAG_NAMES

    public static final String FLAG_NAMES
    The "flag_names" attribute name for the designation associated with a range element. This attribute can be associated to variables. If specified, they shall be one flag name for each flag mask, flag value and flag meaning.

    Path in ISO 19115:

    - `Metadata` / `contentInfo` / `rangeElementDescription` / `name`
    See Also:
      - Constant Field Values

  - ### FLAG_MASKS

    public static final String FLAG_MASKS
    The "flag_masks" attribute name for bitmask to apply on sample values before to compare them to the flag values.

    Path in ISO 19115:

    - `Metadata` / `contentInfo` / `rangeElementDescription` / `rangeElement`
    See Also:
      - Constant Field Values

  - ### FLAG_VALUES

    public static final String FLAG_VALUES
    The "flag_values" attribute name for sample values to be flagged. The flag masks, flag values and flag meaning attributes, used together, describe a blend of independent boolean conditions and enumerated status codes. A flagged condition is identified by a bitwise AND of the variable value and each flag masks value; a result that matches the flag values value indicates a true condition.

    Path in ISO 19115:

    - `Metadata` / `contentInfo` / `rangeElementDescription` / `rangeElement`
    See Also:
      - Constant Field Values

  - ### FLAG_MEANINGS

    public static final String FLAG_MEANINGS
    The "flag_meanings" attribute name for the meaning of flag values. Each flag values and flag masks must coincide with a flag meanings.

    Path in ISO 19115:

    - `Metadata` / `contentInfo` / `rangeElementDescription` / `definition`
    See Also:
      - Constant Field Values

  - ### METADATA_LINK

    public static final String METADATA_LINK
    The "metadata_link" attribute name for a URL that gives the location of more complete metadata. For example, it may be the URL to an ISO 19115 metadata in XML format.

    Path in ISO 19115:

    - `Metadata` / `metadataLinkage` / `linkage`
    Since:
      0.8
    See Also:
      - ESIP reference
      - Constant Field Values

- ## Constructor Details

  - ### AttributeNames

    protected AttributeNames()
    For subclass constructors only. `AttributeNames` may be sub-classed by communities defining domain-specific attributes in addition to the ones defined by the CF convention.