Data Discovery (ACDD)

The netCDF Group at Unidata recommended a set of netCDF attributes (the NetCDF Attribute Convention for Dataset Discovery) to enable data discovery nearly a decade ago. This convention was designed to augment the Climate-Forecast conventions that were already being used to ease access to data in netCDF by tools. The ACDD was adopted as the basis for the ncISO tool developed at NGDC and incorporated into THREDDS with the goal of providing ISO 19115-compliant discovery metadata for datasets in THREDDS that supported the ACDD. The governance of these conventions has since been taken over by the ESIP Documentation Cluster.

This page includes ACDD recommendations at three levels: highly recommended, recommended, and suggested.

Attribute Convention for Data Discovery - Highly Recommended

These attributes are highly recommended by the Attribute Convention for Data Discovery

Source: ACDD Home Page

Concept	Description	Dialect (Fit) Paths
Resource Title	A short description of the resource. The title should be descriptive enough so that when a user is presented with a list of titles the general content of the data set can be determined.	ISO /*/gmd:identificationInfo/*/gmd:citation/gmd:CI_Citation/gmd:title/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:citation/cit:CI_Citation/cit:title/gco:CharacterString ECHO /*/echo:ShortName>/*/echo:LongName DIF /dif:DIF/dif:Entry_Title DIF /dif:DIF/dif:Data_Set_Citation/dif:Dataset_Title ECS /*/ecs:ShortName > /*/ecs:LongName FGDC /fgdc:metadata/fgdc:idinfo/fgdc:citation/fgdc:citeinfo/fgdc:title DCAT dct:title
Abstract	A paragraph describing the resource. Note: This concept is called "Desciption" in Catalog Services for the Web.	ISO /*/gmd:identificationInfo/*/gmd:abstract/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:abstract/gco:CharacterString ECHO /*/echo:Description DIF /dif:DIF/dif:Summary/dif:Abstract ECS /*/ecs:CollectionDescription ECS /*/ecs:LongName FGDC /fgdc:metadata/fgdc:idinfo/fgdc:descript/fgdc:abstract DCAT dct:description
Keyword	A word or phrase that describes some aspect of a resource. Can be one of several types. Note: The general identification keywords usually have a type of "theme" and are refered to as "theme keywords". Other types and vocabularies are used for other information. Service Entry Resource Format (SERF) requires a Science and a Service GCMD Keyword. This concept is called "Subject" in the CSW Specification.	ISO (1) /*/gmd:identificationInfo/*/gmd:descriptiveKeywords/gmd:MD_Keywords[gmd:type/gmd:MD_KeywordTypeCode='theme']/gmd:keyword/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:descriptiveKeywords/mri:MD_Keywords[mri:type/mri:MD_KeywordTypeCode='theme']/mri:keyword/gco:CharacterString ECHO (1) /*/echo:ScienceKeywords/echo:ScienceKeyword/echo:CategoryKeyword ECHO (1) /*/echo:ScienceKeywords/echo:ScienceKeyword/echo:TopicKeyword ECHO (1) /*/echo:ScienceKeywords/echo:ScienceKeyword/echo:TermKeyword ECHO (1) /*/echo:ScienceKeywords/echo:ScienceKeyword/echo:VariableLevel1Keyword/echo:Value ECHO (1) /*/echo:ScienceKeywords/echo:ScienceKeyword/echo:VariableLevel2Keyword/echo:Value ECHO (1) /*/echo:ScienceKeywords/echo:ScienceKeyword/echo:VariableLevel3Keyword ECHO (1) /*/echo:ScienceKeywords/echo:ScienceKeyword/echo:DetailedVariableKeyword DIF (1) /dif:DIF/dif:Parameters/dif:Category DIF (1) /dif:DIF/dif:Parameters/dif:Topic DIF (1) /dif:DIF/dif:Parameters/dif:Term DIF (1) /dif:DIF/dif:Parameters/dif:Variable_Level_1 DIF (1) /dif:DIF/dif:Parameters/dif:Variable_Level_2 DIF (1) /dif:DIF/dif:Parameters/dif:Variable_Level_3 DIF (1) /dif:DIF/dif:Parameters/dif:Detailed_Variable ECS (1) /*/ecs:DisciplineTopicParameters/ecs:DisciplineKeyword ECS (1) /*/ecs:DisciplineTopicParameters/ecs:TopicKeyword ECS (1) /*/ecs:DisciplineTopicParameters/ecs:TermKeyword ECS (1) /*/ecs:DisciplineTopicParameters/ecs:VariableKeyword FGDC (1) /fgdc:metadata/fgdc:idinfo/fgdc:keywords/fgdc:theme/fgdc:themekey

Attribute Convention for Data Discovery - Recommended

These attributes are recommended by the Attribute Convention for Data Discovery

Source: ACDD Home Page

Concept	Description	Dialect (Fit) Paths
Resource Identifier	Identifier for the resource described by the metadata	ISO /*/gmd:identificationInfo/*/gmd:citation/gmd:CI_Citation/gmd:identifier/gmd:MD_Identifier/gmd:code/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:citation/cit:CI_Citation/cit:identifier/mcc:MD_Identifier/mcc:code/gco:CharacterString ECHO /*/echo:DataSetId ECHO (1) /*/echo:ShortName | /*/echo:LongName DIF /dif:DIF/dif:Data_Set_Citation/dif:Dataset_DOI
Naming Authority	The organization responsible for the maintenance of the identifier (namespace) Note: DIF and ECHO use the Global Change Master Directory (GCMD) keywords.	ISO /*/gmd:identificationInfo/*/gmd:citation/gmd:CI_Citation/gmd:identifier/gmd:MD_Identifier/gmd:authority ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:citation/cit:CI_Citation/cit:identifier/mcc:MD_Identifier/mcc:codeSpace/gco:CharacterString
Keyword Vocabulary	If you are following a guideline or using a shared vocabulary for the words/phrases in your "keywords" attribute, put the name of that guideline here. Note: DIF, ECHO and ECS require that theme keywords come from the Global Change Master Directory list.	ISO /*/gmd:identificationInfo/*/gmd:descriptiveKeywords/gmd:MD_Keywords[gmd:type/gmd:MD_KeywordTypeCode='theme']/gmd:thesaurusName/gmd:CI_Citation/gmd:title/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:descriptiveKeywords/mri:MD_Keywords[mri:type/mri:MD_KeywordTypeCode='theme']/mri:thesaurusName/cit:CI_Citation
Common Data Model Datatype	The THREDDS data type for this resource. Note: Current values: vector, grid, textTable, tin, stereoModel, video.	ISO /*/gmd:identificationInfo/*/gmd:spatialRepresentationType/gmd:MD_SpatialRepresentationTypeCode ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:spatialRepresentationType/mcc:MD_SpatialRepresentationTypeCode
Lineage Statement	Information and references for sources and processes that were used to create the dataset and an audit trail for modifications to the original data.	ISO /*/gmd:dataQualityInfo/gmd:DQ_DataQuality/gmd:lineage/gmd:LI_Lineage/gmd:statement/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:resourceLineage/mrl:LI_Lineage/mrl:statement/gco:CharacterString
Resource Creation/Revision Date	The date the resource was created	ISO //gmd:CI_Citation/gmd:date/gmd:CI_Date[gmd:dateType/gmd:CI_DateTypeCode='creation']/gmd:date/gco:Date ISO //gmd:CI_Citation/gmd:date/gmd:CI_Date[gmd:dateType/gmd:CI_DateTypeCode='creation']/gmd:date/gco:DateTime ISO //gmd:CI_Citation/gmd:date/gmd:CI_Date[gmd:dateType/gmd:CI_DateTypeCode='revision']/gmd:date/gco:Date ISO //gmd:CI_Citation/gmd:date/gmd:CI_Date[gmd:dateType/gmd:CI_DateTypeCode='revision']/gmd:date/gco:DateTime ISO //gmd:CI_Citation/gmd:date/gmd:CI_Date[gmd:dateType/gmd:CI_DateTypeCode='publication']/gmd:date/gco:Date ISO //gmd:CI_Citation/gmd:date/gmd:CI_Date[gmd:dateType/gmd:CI_DateTypeCode='publication']/gmd:date/gco:DateTime ISO-1 //cit:CI_Citation/cit:date/cit:CI_Date[cit:dateType/cit:CI_DateTypeCode='creation']/cit:date/gco:DateTime ISO-1 //cit:CI_Citation/cit:date/cit:CI_Date[cit:dateType/cit:CI_DateTypeCode='revision']/cit:date/gco:DateTime ISO-1 //cit:CI_Citation/cit:date/cit:CI_Date[cit:dateType/cit:CI_DateTypeCode='publication']/cit:date/gco:DateTime ECHO /*/echo:InsertTime ECHO /*/echo:LastUpdate DIF /dif:DIF/dif:Data_Set_Citation/dif:Dataset_Release_Date ECS /*/ecs:RevisionDate DCAT dct:modified
Resource Contact	The organization or person responsible for answering questions about the resource.	ISO /*/gmd:identificationInfo/*/gmd:pointOfContactPro ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:pointOfContact/cit:CI_Responsibility[cit:role/cit:CI_RoleCode='pointOfContact'] ECHO /*/echo:Contacts/echo:Contact DIF /dif:DIF/dif:Personnel[dif:Role='INVESTIGATOR'] ECS /CollectionMetaDataFile/CollectionMetaDataSets/Collections/CollectionMetaData/Contact[Role='User Services'] DCAT dct:person
Author / Originator World Wide Web Address	The World Wide Web mail address of the principal author of the cited resource	ISO //gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty[gmd:role/gmd:CI_RoleCode = 'author']/gmd:contactInfo/gmd:CI_Contact/gmd:onlineResource/gmd:CI_OnlineResource/gmd:linkage/gmd:URL ISO-1 //cit:CI_Citation/cit:citedResponsibleParty/cit:CI_Responsibility[cit:Role/cit:CI_RoleCode='publisher']/cit:party/cit:CI_Organisation/cit:contactInfo/cit:CI_Contact/cit:onlineResource/cit:CI_OnlineResource/cit:linkage
Author / Originator Email Address	The electronic mail address of the principal author of the resource	ISO /*/gmd:identificationInfo/*/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty[gmd:role/gmd:CI_RoleCode = 'author']/gmd:contactInfo/gmd:CI_Contact/gmd:address/gmd:CI_Address/gmd:electronicMailAddress/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:citation/cit:CI_Citation/cit:citedResponsibleParty/cit:CI_Responsibility/cit:party/cit:CI_Individual/cit:contactInfo/cit:CI_Contact/cit:address/cit:CI_Address/cit:electronicMailAddress/gco:CharacterString DIF /dif:DIF/dif:Data_Set_Citation/dif:Dataset_Creator
Originating Organization	The organization responsible for creating the resource	ISO /*/gmd:identificationInfo/*/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty/gmd:organisationName/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:citation/cit:CI_Citation/cit:citedResponsibleParty/cit:CI_Responsibility[cit:role/cit:CI_RoleCode='author']/cit:party/cit:CI_Organisation/cit:name/gco:CharacterString ECHO /*/echo:ProcessingCenter DIF /dif:DIF/dif:Originating_Center FGDC /fgdc:metadata/fgdc:distinfo/fgdc:distrib/fgdc:cntinfo/fgdc:cntperp/fgdc:cntorg FGDC /fgdc:metadata/fgdc:idinfo/fgdc:citation/fgdc:citeinfo/fgdc:origin
Project Name	The name of the project that the resource was associated with.	ISO /*/gmd:identificationInfo/*/gmd:aggregationInfo/gmd:MD_AggregateInformation/gmd:aggregateDataSetName/gmd:CI_Citation/gmd:title/gco:CharacterString DS_AssociationTypeCode="largerWorkCitation" and DS_InitiativeTypeCode="project" ISO /*/gmd:identificationInfo/*/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:keyword/gco:CharacterString with gmd:MD_KeywordTypeCode="project" ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:associatedResource/mri:MD_AssociatedResource[mri:initiativeType/mri:DS_InitiativeTypeCode='project']/mri:name/cit:CI_Citation/cit:title/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:descriptiveKeywords/mri:MD_Keywords[mri:type/mri:MD_KeywordTypeCode='project']/mri:keyword/gco:CharacterString ECHO /*/echo:Campaigns/echo:Campaign/echo:ShortName and /*/echo:Campaigns/echo:Campaign/echo:LongName DIF /dif:DIF/dif:Project/dif:Short_Name DIF /dif:DIF/dif:Project/dif:Long_Name
Processing Level	A code that indicates the extent of processing done in the creation of a dataset.	ISO /*/gmd:contentInfo/gmd:MD_ImageDescription/gmd:processingLevelCode/gmd:MD_Identifier/gmd:code/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:processingLevel/mcc:MD_Identifier/mcc:code/gco:CharacterString ECHO /*/echo:ProcessingLevelId ECS /*/ecs:ProcessingLevelId
Acknowledgement	Provides a place to acknowledge various types of support for the project that produced the data.	ISO /*/gmd:identificationInfo/*/gmd:credit/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:credit/gco:CharacterString>
Bounding Box	A bounding box for identifying a geographic area of interest Note: This concept is called "Coverage" in the CSW Specification	ISO /*/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox ISO /*/gmd:identificationInfo/srv:SV_ServiceIdentification/srv:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:extent/gex:EX_Extent/gex:geographicElement/gex:EX_GeographicBoundingBox ECHO /*/echo:Spatial/echo:HorizontalSpatialDomain/echo:Geometry/echo:BoundingRectangle DIF /dif:DIF/dif:Spatial_Coverage FGDC /fgdc:metadata/fgdc:idinfo/fgdc:spdom/fgdc:bounding
Southernmost Latitude	The southernmost latitude of the bounding rectangle. Note: OGC-SOS offering lists may not include the entire dataset. A gml:id attribute can be used to identify the bounding offering.	ISO (1) /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:southBoundLatitude/gco:Decimal ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:extent/gex:EX_Extent/gex:geographicElement/gex:EX_GeographicBoundingBox/gex:southBoundLatitude/gco:Decimal ECHO (1) /*/echo:Spatial/echo:HorizontalSpatialDomain/echo:Geometry/echo:BoundingRectangle/echo:SouthBoundingCoordinate DIF (1) /dif:DIF/dif:Spatial_Coverage/dif:Southernmost_Latitude ECS (1) /*/ecs:Spatial/ecs:HorizontalSpatialDomain/ecs:BoundingRectangle/ecs:SouthBoundingCoordinate FGDC (1) /fgdc:metadata/fgdc:idinfo/fgdc:spdom/fgdc:bounding/fgdc:southbc DCAT dct:spatial
Northernmost Latitude	The northernmost latitude of the bounding rectangle. Note: OGC-SOS offering lists may not include the entire dataset. A gml:id attribute (e.g. gml:id="network-all") can be used to identify the bounding offering.	ISO (1) /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:northBoundLatitude/gco:Decimal ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:extent/gex:EX_Extent/gex:geographicElement/gex:EX_GeographicBoundingBox/gex:northBoundLatitude/gco:Decimal ECHO (1) /*/echo:Spatial/echo:HorizontalSpatialDomain/echo:Geometry/echo:BoundingRectangle/echo:NorthBoundingCoordinate DIF (1) /dif:DIF/dif:Spatial_Coverage/dif:Northernmost_Latitude ECS (1) /*/ecs:Spatial/ecs:HorizontalSpatialDomain/ecs:BoundingRectangle/ecs:NorthBoundingCoordinate FGDC (1) /fgdc:metadata/fgdc:idinfo/fgdc:spdom/fgdc:bounding/fgdc:northbc DCAT dct:spatial
Westernmost Longitude	The westernmost longitude of the bounding rectangle. Note: OGC-SOS offering lists may not include the entire dataset. A gml:id attribute can be used to identify the bounding offering.	ISO (1) /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:westBoundLongitude/gco:Decimal ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:extent/gex:EX_Extent/gex:geographicElement/gex:EX_GeographicBoundingBox/gex:westBoundLongitude/gco:Decimal ECHO (1) /*/echo:Spatial/echo:HorizontalSpatialDomain/echo:Geometry/echo:BoundingRectangle/echo:WestBoundingCoordinate DIF (1) /dif:DIF/dif:Spatial_Coverage/dif:Westernmost_Longitude ECS (1) /*/ecs:Spatial/ecs:HorizontalSpatialDomain/ecs:BoundingRectangle/ecs:WestBoundingCoordinate FGDC (1) /fgdc:metadata/fgdc:idinfo/fgdc:spdom/fgdc:bounding/fgdc:westbc DCAT dct:spatial
Easternmost Longitude	The easternmost longitude of the bounding rectangle. Note: OGC-SOS offering lists may not include the entire dataset. A gml:id attribute can be used to identify the bounding offering.	ISO (1) /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:eastBoundLongitude/gco:Decimal ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:extent/gex:EX_Extent/gex:geographicElement/gex:EX_GeographicBoundingBox/gex:eastBoundLongitude/gco:Decimal ECHO (1) /*/echo:Spatial/echo:HorizontalSpatialDomain/echo:Geometry/echo:BoundingRectangle/echo:WestBoundingCoordinate DIF (1) /dif:DIF/dif:Spatial_Coverage/dif:Easternmost_Longitude ECS (1) /*/ecs:Spatial/ecs:HorizontalSpatialDomain/ecs:BoundingRectangle/ecs:EastBoundingCoordinate FGDC (1) /fgdc:metadata/fgdc:idinfo/fgdc:spdom/fgdc:bounding/fgdc:eastbc DCAT dct:spatial
Start Time	The start of the bounding time period	ISO /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:temporalElement/gmd:EX_TemporalExtent/gmd:extent/gml:TimePeriod/gml:beginPosition ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:extent/gex:EX_Extent/gex:temporalElement/gex:EX_TemporalExtent/gex:extent/gml:TimePeriod/gml:begin/gml:TimeInstant/gml:timePosition ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:extent/gex:EX_Extent/gex:temporalElement/gex:EX_TemporalExtent/gex:extent/gml:TimePeriod/gml:beginPosition ECHO /*/echo:Temporal/echo:RangeDateTime/echo:BeginningDateTime DIF /dif:DIF/dif:Temporal_Coverage/dif:Start_Date DCAT dct:temporal
End Time	The end of the bounding time period	ISO /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:temporalElement/gmd:EX_TemporalExtent/gmd:extent/gml:TimePeriod/gml:endPosition ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:extent/gex:EX_Extent/gex:temporalElement/gex:EX_TemporalExtent/gex:extent/gml:TimePeriod/gml:end/gml:TimeInstant/gml:timePosition ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:extent/gex:EX_Extent/gex:temporalElement/gex:EX_TemporalExtent/gex:extent/gml:TimePeriod/gml:endPosition ECHO /*/echo:Temporal/echo:RangeDateTime/echo:EndingDateTime ECHO /*/echo:Temporal/echo:EndsAtPresentFlag DIF /dif:DIF/dif:Temporal_Coverage/dif:Stop_Date ECS /*/ecs:Temporal/ecs:RangeDateTime/ecs:RangeBeginningDate ECS /*/ecs:Temporal/ecs:RangeDateTime/ecs:RangeBeginningTime ECS /*/ecs:Temporal/ecs:RangeDateTime/ecs:RangeEndingDate ECS /*/ecs:Temporal/ecs:RangeDateTime/ecs:RangeEndingTime DCAT dct:temporal
Vertical Minimum	The minimum height of the bounding rectangle	ISO /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:verticalElement/gmd:EX_VerticalExtent/gmd:minimumValue/gco:Real ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:extent/gex:EX_Extent/gex:verticalElement/gex:EX_VerticalExtent/gex:minimumValue/gco:Real DIF /dif:DIF/dif:Spatial_Coverage/dif:Minimum_Altitude DIF /dif:DIF/dif:Spatial_Coverage/dif:Minimum_Depth
Temporal Extent	The temporal extent of the resource	ISO /*/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:temporalElement/gmd:EX_TemporalExtent ISO-1 /*/mri:MD_DataIdentification/mri:extent/gex:EX_Extent/gex:temporalElement/gex:EX_TemporalExtent ECHO /*/Temporal/RangeDateTime FGDC /fgdc:metadata/fgdc:idinfo/fgdc:timeperd/fgdc:timeinfo/fgdc:rngdates
Temporal Resolution	The smallest time step included in the resource.	ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:temporalResolution/gts:TM_PeriodDuration
Standard Name Vocabulary	The name of the shared vocabulary from which variable standard names are taken.	ISO /*/gmd:identificationInfo/*/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:thesaurusName/gmd:CI_Citation/gmd:title/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:descriptiveKeywords/mri:MD_Keywords[mri:type/mri:MD_KeywordTypeCode='theme']/mri:thesaurusName/cit:CI_Citation/cit:title/gco:CharacterString
Vertical Maximum	The maximum height of the bounding rectangle	ISO /*/gmd:identificationInfo/*/gmd:extent/gmd:EX_Extent/gmd:verticalElement/gmd:EX_VerticalExtent/gmd:maximumValue/gco:Real ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:extent/gex:EX_Extent/gex:verticalElement/gex:EX_VerticalExtent/gex:maximumValue/gco:Real DIF /dif:DIF/dif:Spatial_Coverage/dif:Maximum_Altitude DIF /dif:DIF/dif:Spatial_Coverage/dif:Maximum_Depth
Resource Access Constraints	Information about any constraints for accessing the data set. This includes any special restrictions, legal prerequisites, limitations and/or warnings on obtaining the data set. Some words that may be used in this field include: Public, In-house, Limited, Additional detailed instructions on how to access the data can be entered in this field.	ISO /*/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:resourceConstraints/gmd:MD_LegalConstraints/gmd:legalConstraints/gmd:MD_RestrictionCode ISO /*/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:resourceConstraints/gmd:MD_LegalConstraints/gmd:otherConstraints/gco:CharacterString ISO /*/gmd:identificationInfo/srv:SV_ServiceIdentification/srv:restrictions/gmd:MD_LegalConstraints/gmd:legalConstraints/gco:CharacterString ISO /*/gmd:identificationInfo/srv:SV_ServiceIdentification/srv:restrictions/gmd:MD_LegalConstraints/gmd:otherConstraints/gco:CharacterString ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:resourceConstraints/mco:MD_Constraints ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:resourceConstraints/mco:MD_LegalConstraints ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:resourceConstraints/mco:MD_SecurityConstraints ECHO /*/echo:RestrictionFlag ECHO /*/echo:RestrictionComment ECHO /*/echo:Visible DIF /dif:DIF/dif:Access_Constraints ECS /*/ecs:AccessConstraints FGDC /fgdc:metadata/fgdc:idinfo/fgdc:accconst

xPath Note: The xPaths included in this table use several wildcards. // means any path, so //gmd:CI_ResponsibleParty indicates a gmd:CI_ResponsibleParty anywhere in an XML file. /*/ indicates a single level with several possible elements. This usually indicates one of several concrete realizations of an abstract object. For example /*/gmd:identificationInfo could be gmd:MD_Metadata/gmd:identificationInfo or gmi:MI_Metadata/gmd:identificationInfo and gmd:identificationInfo/*/gmd:descriptiveKeywords could be gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords or gmd:identificationInfo/srv:SV_ServiceIdentification/gmd:descriptiveKeywords. Fit: The fit of the dialect path with the concept is estimated on a scale of 1 = excellent two-way fit, 2 = one-way fit or some other problem, 3 - extension required.

Attribute Convention for Data Discovery - Suggested

These attributes are suggested by the Attribute Convention for Data Discovery

Source: ACDD Home Page

Concept	Description	Dialect (Fit) Paths
Contributor Name	Contributor to the resource	ISO /*/gmd:identificationInfo/*/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty[gmd:role/gmd:CI_RoleCode = 'author'] ISO /*/gmd:identificationInfo/*/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty[gmd:role/gmd:CI_RoleCode = 'originator'] ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:citation/cit:CI_Citation/cit:citedResponsibleParty/cit:CI_Responsibility[cit:role/cit:CI_RoleCode='manyOptions'] THREDDS /thredds:catalog/thredds:metadata/thredds:contributor THREDDS /thredds:catalog/thredds:dataset/thredds:contributor netCDF /nc:netcdf/nc:attribute[@nc:name=creator_name]/@nc:value netCDF /nc:netcdf/nc:attribute[@nc:name=contributor_name]/@nc:value
Contributor Role	The role of any individuals or institutions that contributed to the creation of the data.	ISO /*/gmd:identificationInfo/*/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty/gmd:role/gmd:CI_RoleCode ISO-1 /mdb:MD_Metadata/mdb:identificationInfo/*/mri:citation/cit:CI_Citation/cit:citedResponsibleParty/cit:CI_Responsibility/cit:role/cit:CI_RoleCode THREDDS /thredds:catalog/thredds:dataset/thredds:contributor/@role THREDDS /thredds:catalog/thredds:metadata/thredds:contributor/@role netCDF /nc:netcdf/nc:attribute[@nc:name=contributor_role]/@nc:value
Publisher	Publisher of the cited resource	DIF /dif:DIF/dif:Data_Set_Citation/dif:Dataset_Publisher DIF /dif:DIF/dif:Reference/dif:Publisher DCAT dct:publisher HDF5.1 /hdf5:HDF5-File/hdf5:RootGroup/hdf5:Attribute[@Name='publisher']/hdf5:Data/hdf5:DataFromFile ISO //gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty[gmd:role/gmd:CI_RoleCode = 'publisher'] ISO-1 //cit:CI_Citation/cit:citedResponsibleParty/cit:CI_Responsibility[cit:role/cit:CI_RoleCode='publisher']/cit:party/cit:CI_Organisation/cit:name/gco:CharacterString THREDDS //thredds:dataset/thredds:publisher/thredds:name THREDDS //thredds:metadata/thredds:publisher/thredds:name netCDF /nc:netcdf/nc:attribute[@nc:name=publisher_name]/@nc:value
Publisher URL	World Wide Web address associated with the publisher of the cited resource	DIF /dif:DIF/dif:Reference/dif:Publication_Place HDF5.1 /hdf5:HDF5-File/hdf5:RootGroup/hdf5:Attribute[@Name='publisher_url']/hdf5:Data/hdf5:DataFromFile ISO //gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty[gmd:role/gmd:CI_RoleCode = ['publisher']/gmd:contactInfo ISO-1 //cit:CI_Citation/cit:citedResponsibleParty/cit:CI_Responsibility[cit:role/cit:CI_RoleCode = ['publisher']/cit:party/cit:CI_Organisation/cit:contactInfo THREDDS //thredds:metadata/thredds:publisher/thredds:contact/@url THREDDS //thredds:dataset/thredds:publisher/thredds:contact/@url netCDF /nc:netcdf/nc:attribute[@nc:name=publisher_url]/@nc:value
Publisher E-Mail	Email associated with the publisher of the cited resource	DIF /dif:DIF/dif:Reference/dif:Publication_Place HDF5.1 /hdf5:HDF5-File/hdf5:RootGroup/hdf5:Attribute[@Name='publisher_email']/hdf5:Data/hdf5:DataFromFile ISO //gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty[gmd:role/gmd:CI_RoleCode = ['publisher']/gmd:contactInfo ISO-1 //cit:CI_Citation/cit:citedResponsibleParty/cit:CI_Responsibility[cit:role/cit:CI_RoleCode = ['publisher']/cit:party/cit:CI_Organisation/cit:contactInfo THREDDS //thredds:metadata/thredds:publisher/thredds:contact/@email THREDDS //thredds:dataset/thredds:publisher/thredds:contact/@email netCDF /nc:netcdf/nc:attribute[@nc:name=publisher_email]/@nc:value

xPath Note: The xPaths included in this table use several wildcards. // means any path, so //gmd:CI_ResponsibleParty indicates a gmd:CI_ResponsibleParty anywhere in an XML file. /*/ indicates a single level with several possible elements. This usually indicates one of several concrete realizations of an abstract object. For example /*/gmd:identificationInfo could be gmd:MD_Metadata/gmd:identificationInfo or gmi:MI_Metadata/gmd:identificationInfo and gmd:identificationInfo/*/gmd:descriptiveKeywords could be gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords or gmd:identificationInfo/srv:SV_ServiceIdentification/gmd:descriptiveKeywords. Fit: The fit of the dialect path with the concept is estimated on a scale of 1 = excellent two-way fit, 2 = one-way fit or some other problem, 3 - extension required.