MEF improvements

Date	2008/08/14
Contact(s)	Fxp
Last edited	Timestamp
Status	being discussed
Assigned to release	to be determined
Resources

Overview

Improving existing MEF format to support more than one metadata in a single MEF file. This mechanism will allow the export n metadata records in a single MEF file with an adequate structure.

Proposal Type

• Type: Module Change
• App: GeoNetwork
• Module: Metadata Import/Export

Links

• Documents:
  • ​http://trac.osgeo.org/geonetwork/wiki/MEF
• Email discussions:
• Other wiki discussions:

Voting History

• Vote proposed by X on Y, result was +/-n (m non-voting members).

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Motivations

Proposal

Requirements are:

• multi-metadata support : be able to have more than one metadata record in a single MEF file.
• multi-metadata format support : be able to store in a single MEF n formats (ISO19139, ISO19139.profile)
• related metadata export : add an option in order to be able to export related metadata in the MEF file. Related metadata record could be :
  • child metadata (Using Lucene index to search for parentChild relation)
  • service metadata (To be defined)
  • related metadata (Using xml.relation.get service)

MEF structure proposal

MEF v1 :

Root
  |
 +--- metadata.xml
 +--- info.xml
 +--- public
  |        +---- all public documents and thumbnails
 +--- private
           +---- all private documents and thumbnails

MEF v2 :

Root 
  | 
 + 0..n metadata
      |
     +--- metadata
      |     +--- metadata.xml (ISO19139)
      |     +--- (optional) metadata.profil.xml (ISO19139profil)
     +--- info.xml
     +--- overviews
     +--- applischema
      |       +--- (optional) schema.xml (ISO19110)
     +--- documents
              +---- all documents

MEF Creation process

• 1.If uuid add this metadata to the selection manager
  • 1.search child and add to selection manager
  • 2.search service and add to selection manager
  • 3.search related and add to selection manager
• 2.if not use the selection manager
• 3.if selection manager is empty return error
• 4.According to format parameter do a MEF export (full/partial)

Backwards Compatibility Issues

• Check with existing implementation of MEF (GvSIG, Talend Spatial, ArcCatalogue plugin)

Risks

Participants

• List of participants and role (if necessary) in current GIP