Definition of temporal extent within WIS Discovery Metadata records
Jeremy
In IPET-MDI meeting 2 we proposed that:
The temporal extent within metadata for bulletins exchanged in real time currently reflects the date at which real time exchange started, rather than the current availability of the bulletins currently travelling within the WIS. A separate record is required for the real time bulletins and for an historical record of the data in the bulletins. The transient nature of the bulletins should be reflected by using a temporal extent in the metadata that indicates the rolling 24h cache of bulletins. A method of doing this is required. (Issue is expressing “now” in ISO 8601).
During the discussion on this point at the ICT-ISS meeting, we concluded that for ‘transient data products’ that are routinely exchanged in the WIS it does not make sense to define a temporal extent for those products; the metadata record is intended to describe a ‘template’ for a data product that is exchanged. Instances of that product may or may not be available from the GISC cache at any given time therefore we cannot authoritatively define a temporal extent for that ‘dataset’.
(As an aside, I wonder if we should invent a new term in MD_ScopeCode ‘template’ to describe this kind of metadata record?)
The recommendation of ICT-ISS is the following Guidance.
1) Please can we update the WIS wiki with this additional Guidance
2) Please can we create a Schematron test to validate this Guidance
Guidance: A WIS Discovery Metadata record describing a transient data product published for global exchange via the WIS should NOT specify temporal extent.
Test method: (i) Inspect the instance document under test to assess whether the metadata record describes a transient data product published for global exchange:
(i.a) Inspect the instance document under test to assess whether the WMO_DistributionScopeCode code list is specified as a keyword thesaurus within an instance of gmd:MD_Keywords using the following XPath:
/gmd:MD_Metadata/gmd:identificationInfo//gmd:descriptiveKeywords/ ↘gmd:MD_Keywords/gmd:thesaurusName/gmd:CI_Citation/gmd:title// = “WMO_DistributionScopeCode”
A gmx:Anchor element may be used to specify the location of the Code List; e.g.
/gmd:MD_Metadata/gmd:identificationInfo//gmd:descriptiveKeywords/ ↘gmd:MD_Keywords/gmd:thesaurusName/gmd:CI_Citation/gmd:title/
↘gmx:Anchor/@xlink:href = “http://wis.wmo.int/2012/codelists/WMOCodeLists.xml#WMO_DistributionScopeCode”
(i.b) Inspect the associated gmd:MD_Keywords element to ensure that the keyword type is specified as “dataCentre” from the (amended) MD_KeywordTypeCode code list; e.g.
/gmd:MD_Metadata/gmd:identificationInfo//gmd:descriptiveKeywords/ ↘gmd:MD_Keywords/gmd:type/gmd:MD_KeywordTypeCode = “dataCentre”
(i.c) Inspect the associated gmd:MD_Keywords element to assess whether the keyword “GlobalExchange” from the WMO_DistributionScopeCode code list is present; e.g.
/gmd:MD_Metadata/gmd:identificationInfo//gmd:descriptiveKeywords/ ↘gmd:MD_Keywords/gmd:keyword = “GlobalExchange”
(iii) Inspect the instance document under test to assess that NO instances of temporal extent element are specified; e.g.
/gmd:MD_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/ ↘gmd:extent/gmd:EX_Extent/gmd:temporalExtent
Jeremy
(i.c) Inspect the associated gmd:MD_Keywords element to assess whether the keyword “GlobalExchange” from the WMO_DistributionScopeCode code list is present; e.g.
(/gmd:MD_Metadata/gmd:identificationInfo//gmd:descriptiveKeywords/ ↘gmd:MD_Keywords/gmd:keyword = “GlobalExchange”) OR (/gmd:MD_Metadata/gmd:identificationInfo//gmd:descriptiveKeywords/ ↘gmd:MD_Keywords/gmd:keyword = “RegionalExchange”)
TOYODA Eizi
----- Original Message -----From: JeremySent: Thursday, June 14, 2012 9:17 PMSubject: Definition of temporal extent within WIS Discovery Metadata recordsIn IPET-MDI meeting 2 we proposed that:
The temporal extent within metadata for bulletins exchanged in real time currently reflects the date at which real time exchange started, rather than the current availability of the bulletins currently travelling within the WIS. A separate record is required for the real time bulletins and for an historical record of the data in the bulletins. The transient nature of the bulletins should be reflected by using a temporal extent in the metadata that indicates the rolling 24h cache of bulletins. A method of doing this is required. (Issue is expressing “now” in ISO 8601).
During the discussion on this point at the ICT-ISS meeting, we concluded that for ‘transient data products’ that are routinely exchanged in the WIS it does not make sense to define a temporal extent for those products; the metadata record is intended to describe a ‘template’ for a data product that is exchanged. Instances of that product may or may not be available from the GISC cache at any given time therefore we cannot authoritatively define a temporal extent for that ‘dataset’.
(As an aside, I wonder if we should invent a new term in MD_ScopeCode ‘template’ to describe this kind of metadata record?)
The recommendation of ICT-ISS is the following Guidance.
<!--[if !supportLists]-->1) <!--[endif]-->Please can we update the WIS wiki with this additional Guidance
<!--[if !supportLists]-->2) <!--[endif]-->Please can we create a Schematron test to validate this Guidance
Jeremy Tandy
TOYODA Eizi
David Thomas
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David Thomas
Chief, Information and Telecommunication System Division
Observing and Information Systems Department
World Meteorological Organization
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Jeremy Tandy
hi Jeremy,perhaps the starting date of the bulletin can also be recorded in the resource maintenance information too?Dave
Steve Foreman
Dr Steve Foreman
Chief, Data Representation, Metadata and Monitoring
World Meteorological Organization
David Thomas
Steve Foreman
Jeremy
On Wednesday, June 20, 2012 7:50:18 AM UTC+1, Steve Foreman wrote:
All,to summarise:1) we remove the temporal extent from the metadata2) we include start date (and end date if known) into the resource maintenance as /gmd:MD_Metadata/gmd:identificationInfo//resourceMaintenance/maintenanceNoteIt would be useful to have "boilerplate text" for people to copy for this.Jeremy has to get the text of the specification agreed very soon - so it would be good to close this issue before 21 June!
Steve
Seems reasonable ...Jeremy
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The information contained in this electronic message and any attachments are intended for specific individuals or entities, and may be confidential, proprietary or privileged. If you are not the intended recipient, please notify the sender immediately, delete this message and do not disclose, distribute or copy it to any third party or otherwise use this message. The content of this message does not necessarily reflect the official position of the World Meteorological Organization (WMO) unless specifically stated. Electronic messages are not secure or error free and may contain viruses or may be delayed, and the sender is not liable for any of these occurrences.
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Dr Steve Foreman
Chief, Data Representation, Metadata and Monitoring
World Meteorological Organization