WORK IN PROGRESS
Changes and additions not yet documented in the concept section of the Wiki.
Schema version not yet released.

---+ Changes from version 2.06 to 2.06a

---++ Schema level additions

<verbatim>/ [header]</verbatim>
   Added attribut: <verbatim>version</verbatim>

---++ Dataset level (incl. Metadata) additions, deprecations, etc.
<verbatim>/Datasets/Dataset/TechnicalContact</verbatim>
   Made optional. 
   Deprecated. 

<verbatim>/Datasets/Dataset/Metadata/InformationWithheld</verbatim>

   Added 

<verbatim>/Datasets/Dataset/Metadata/DirectAccessURI</verbatim>
   Description: An electronic source of the dataset (e.g. web address of query interface or download site).
   Added

<verbatim>/Datasets/Dataset/DatasetExtension</verbatim>
   Added (to provide possibility to extend the metadata).

---++ Dataset level (incl. Metadata) description changes, clarifications, etc.

<verbatim>/Datasets/Dataset/ContentContact</verbatim>
   Removed ref. to UDDI in description

<verbatim>/Datasets/Dataset/Metadata/RevisionData/DateModified</verbatim>
   Indexers should be alerted and action should be taken to notify providers about their metadata.

<verbatim>/Datasets/Dataset/Metadata/Version/Major</verbatim>
   Change description. Old: “The major version number ('1' in 1.2) as defined by the content creators.” New: “The major version number ('1' in 1.2) as defined by the content creators, or the only version number given.” 

---++ Unit level additions, deprecated elements, etc.

<verbatim>/Datasets/Dataset/Unit/SpecimenUnit/History/PreviousUnits/PreviousUnit/PreviousUnitGUID </verbatim>
   Added

<verbatim>/Datasets/Dataset/Unit/SpecimenUnit/History/PreviousUnits/PreviousUnit/ PreviousSourceInstitutionID</verbatim>
   Made optional

<verbatim>/Datasets/Dataset/Unit/SpecimenUnit/History/PreviousUnits/PreviousUnit/ PreviousSourceID</verbatim>
   Made optional

<verbatim>/Datasets/Dataset/Unit/SpecimenUnit/History/PreviousUnits/PreviousUnit/ PreviousUnitID</verbatim>
   Made optional

<verbatim>/Datasets/Dataset/Unit/Associations/UnitAssociations/UnitGUID</verbatim>
   Added

<verbatim>/Datasets/Dataset/Unit/Sequences/Sequence/URI</verbatim>
   Added

<verbatim>/Datasets/Dataset/Unit/InformationWithheld</verbatim>
   Added 

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/FootprintWKT</verbatim>
   Added [[compatible][with DwC Geospatial Extension Schema v. 0.3, 2006-09-12]]

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/FootprintSpatialFit</verbatim>
   Added [[compatible][with DwC Geospatial Extension Schema v. 0.3, 2006-09-12]]

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/Biotope/MeasurementsOrFacts/....(type content)</verbatim>
   The container element was erroneously typed instead of adding a unbounded element. The description alerts users that these elements should not be used

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/Biotope/MeasurementsOrFacts/MeasurementOrFact</verbatim> 
   Added [[unbound,][type MeasurementOrFact]]

<verbatim> InterimVersion206aDataSets/DataSet/Units/Unit/Gathering/NearNamedPlaces/NamedPlaceRelation@DerivedFlag</verbatim>
   Deprecated.

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLong/PointRadiusSpatialFit</verbatim>
   Added [[compatible][with DwC Geospatial Extension 1.4]]

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLong/VerbatimLongitude</verbatim>
   Added [[compatible][with DwC Geospatial Extension 1.4]]

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLong/VerbatimLatitude</verbatim>
   Added [[compatible][with DwC Geospatial Extension 1.4]]

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/GeoreferenceSources</verbatim>
   Added [[compatible][with DwC Geospatial Extension 1.4]]

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/GeoreferenceVerificationStatus</verbatim>
   Added [[compatible][with DwC Geospatial Extension 1.4]]

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/GeoreferenceRemarks</verbatim>
   Added [[compatible][with DwC Geospatial Extension 1.4]]

<verbatim>/Datasets/Dataset/Unit/HerbariumUnit/DuplicatesDistributedTo</verbatim>
   Deprecated, use <verbatim>/Datasets/Dataset/Unit/SpecimenUnit/DuplicatesDistributedTo </verbatim> instead. 

<verbatim>/DataSets/DataSet/Units/Unit/HerbariumUnit/NaturalOccurrence</verbatim>
   Added (type: string; equivalent to HISPID posnat field)

<verbatim>/DataSets/DataSet/Units/Unit/HerbariumUnit/CultivatedOccurrence</verbatim>
   Added (type: string; equivalent to HISPID poscul field)

<verbatim>/DataSets/DataSet/Units/Unit/CultureCollectionUnit/ InterimVersion206aGrowthConditionAtomised/Temperature@TemperatureType</verbatim>
   Deprecated. 

<verbatim>/DataSets/DataSet/Units/Unit/CultureCollectionUnit/ InterimVersion206aGrowthConditionAtomised/Temperature@scale</verbatim>
   Added (to replace deprecated attribute <verbatim>TemperatureType</verbatim>)


---++ Unit level: changes in types affecting multiple elements

<verbatim>LookupL [type]</verbatim>
   Attribute <verbatim>language</verbatim>

   Added

   Attribute <verbatim>Language</verbatim>

   Deprecated.  

   Affects the following leaf elements:

   <verbatim>/DataSets/DataSet/Units/Unit/Gathering/Stratigraphy/ChronostratigraphicTerms/ChronostratigraphicTerm</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Gathering/Stratigraphy/BiostratigraphicTerms/BiostratigraphicTerm</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Gathering/Stratigraphy/LithostratigraphicTerms/LithostratigraphicTerm</verbatim>


<verbatim>Reference [type]</verbatim> 
   Add element: <verbatim>DOI</verbatim>

   Affects the following leaf elements:

   <verbatim>/DataSets/DataSet/Units/Unit/SourceReference</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/UnitReferences/UnitReference</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Identifications/Identification/Identifiers/IdentificationSource</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Identifications/Identification/References/Reference</verbatim>

   
<verbatim>/DataSets/DataSet/Units/Unit/SpecimenUnit/NomenclaturalTypeDesignations/NomenclaturalTypeDesignation/NomenclaturalReference</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/CultureCollectionUnit/References/Reference</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Gathering/Altitude/MeasurementOrFactAtomised/MeasurementOrFactReference</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Gathering/Depth/MeasurementOrFactAtomised/MeasurementOrFactReference</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Gathering/Height/MeasurementOrFactAtomised/MeasurementOrFactReference</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteMeasurementsOrFacts/SiteMeasurementOrFact/MeasurementOrFactAtomised/MeasurementOrFactReference</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Gathering/Biotope/MeasurementsOrFacts/MeasurementOrFactAtomised/MeasurementOrFactReference</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/MeasurementsOrFacts/MeasurementOrFact/MeasurementOrFactAtomised/MeasurementOrFactReference</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Sequences/Sequence/Reference</verbatim>


<verbatim>Contact [type]</verbatim>
   Add <verbatim>URIs/URI</verbatim>

   Affects the following leaf elements:

   <verbatim>/DataSets/DataSet/Metadata/Owners/Owner</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Owner</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/UnitContentContacts/UnitContentContact</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/SpecimenUnit/Owner</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/SpecimenUnit/Acquisition/AcquiredFrom</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/SpecimenUnit/Preparations/Preparation/PreparationAgent</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Gathering/Project/Contact</verbatim>

   <verbatim>/DataSets/DataSet/Units/Unit/Sequences/Sequence/SequencingAgent</verbatim>


---++ Unit level: correction of elements without type

<verbatim>/DataSets/DataSet/Units/Unit/Identifications/Identification/Result/TaxonIdentified/ScientificName/NameAtomised/Viral/Acronym</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/SpecimenUnit/NomenclaturalTypeDesignations/NomenclaturalTypeDesignation/TypifiedName/NameAtomised/Viral/Acronym</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/Synecology/AssociatedTaxa/TaxonIdentified/ScientificName/NameAtomised/Viral/Acronym</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/Identifications/Identification/Identifiers/IdentifiersText</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/Identifications/Identification/Identifiers/IdentifierRole</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/SpecimenUnit/History/PreviousUnits/PreviousUnit/PreviousSourceInstitutionID</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/SpecimenUnit/DuplicatesDistributedTo</verbatim>
   Type set from undefined to String. 

<verbatim>/DataSets/DataSet/Units/Unit/CultureCollectionUnit/Strain</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/CultureCollectionUnit/Pathovar</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/BotanicalGardenUnit/PlantingDate</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/BotanicalGardenUnit/Perennation</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/BotanicalGardenUnit/BreedingSystem</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesUTM/UTMSubzone</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesUTM/UTMNS</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesUTM/UTMZoneFull</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesUTM/UTMDatum</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLong/CoordinatesText</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/PlantGeneticResourcesUnit/PlantGeneticResourcesUnit/BreedingCountryCode</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/PlantGeneticResourcesUnit/PlantGeneticResourcesUnit/GatheringInstitutionCode</verbatim>
   Type set from undefined to FAOInstitutionCode

<verbatim>/DataSets/DataSet/Units/Unit/PlantGeneticResourcesUnit/PlantGeneticResourcesUnit/AccessionNames/AccessionName</verbatim>
   Type set from undefined to String

<verbatim>/DataSets/DataSet/Units/Unit/PlantGeneticResourcesUnit/PlantGeneticResourcesUnit/AccessionNames/AccessionNameText</verbatim>
   Type set from undefined to String

---++ Unit level description changes, clarifications, etc.

<verbatim>/Datasets/Dataset/Unit/UnitGUID</verbatim>
   Changed description to make clear that this unique identifier refers to the original unit (specimen or original observation act), not this specific record of it.

<verbatim>/Datasets/Dataset/Unit/History/PreviousUnits/PreviousUnitsText</verbatim>
   Edited annotation.

<verbatim>/Datasets/Dataset/Unit/Associations/UnitAssociations</verbatim>
   Edited description to make clear that the relationship described is between units and not between unit records

<verbatim>/Datasets/Dataset/Unit/Associations/UnitAssemblages</verbatim>
   Edited description to make clear that the relationship described is between units and not between unit records

<verbatim>/Datasets/Dataset/Unit/EAnnotations</verbatim>
   Edited description to clarify that these are electronic annotations that have not (yet) been made part of the structured record.

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/NearNamedPlaces/NamedPlaceRelation/NearNamedPlace</verbatim>
   Description: Changed from "The nearest named place .." to "A named place near to the collection or observation location".

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinateMethod</verbatim>
   Decription: Added "Equivalent to <verbatim>GeoreferenceProtocol</verbatim> in DwC Geospatial Extension 1.4.

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLong/LongitudeDecimal</verbatim>
   Description: Added "Equivalent to <verbatim>DecimalLongitude</verbatim> in DwC Geospatial Extension v. 1.4 without restrictions".

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLong/LatitudeDecimal</verbatim>
   Description: Added "Equivalent to <verbatim>DecimalLatitude</verbatim> in DwC Geospatial Extension v. 1.4 without restrictions".

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLong/SpatialDatum</verbatim>
   Description: Added "Equivalent to <verbatim>GeodeticDatum</verbatim> in DwC Geospatial Extension v. 1.4.".

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLong/CoordinateErrorDistanceInMeters</verbatim>
   Description: Added "Equivalent to <verbatim>CoordinateUncertaintyInMeters</verbatim> in DwC Geospatial Extension v. 1.4.".

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLong/CoordinateErrorMethod</verbatim>
   Description: Added "Verbatim statement of how the Coordinate Error was determined."

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLong/AccuracyStatement</verbatim>
   Description: Added "May include indication that accuracy has deliberately been generalised, e.g. to protect sensitive data about protected species.".

<verbatim>/DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLong/CoordinatesText</verbatim>
   Description: Added "Equivalent to <verbatim>VerbatimCoordinates</verbatim> in DwC Geospatial Extension v. 1.4.".

<verbatim>/DataSets/DataSet/Units/Unit/Identifications/Identification/PreferredFlag</verbatim>
   It was pointed out that this is normally handled by an attribute. However, in this case several elements marked as preferred are possible.

<verbatim>IPRStatements [type]</verbatim> <verbatim>TermsOfUseStatements/TermsOfUse</verbatim>
   The suggestion to rename to <verbatim>TermsOfUseStatements/TermsOfUseStatement</verbatim> for consistency was rejected by the Tervuren meeting, the description was changed to point out the tolerated inconsistency. 

---++ Types added
from http://rs.tdwg.org/dwc/basetypes.xsd to support compatibility with DwC Spatial Extensions

<verbatim>positiveDouble</verbatim>

<verbatim>decimalLatitudeDataType</verbatim>
   [[not][used in ABCD v.2.06a]]

<verbatim>decimalLongitudeDataType</verbatim>
   [[not][used in ABCD v.2.06a]]

<verbatim>spatialFitDataType</verbatim>