= 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).

----

== 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