Metadata Collections & QA

Overview: ADN version 0.6.50

This page describes characteristics of a particular DLESE metadata framework and version number. Topics include:

Required metadata

Required metadata: Cataloger provided

  • Title - the name of the resource
  • URL or access information - the url to an online resource or access information to a physical object
  • Description - a narrative describing the content, purpose or goal of the resource
  • Subject - general topic areas that the resource is about or covers
  • Technical requirements - information related to platform requirements, browsers and plug-ins, etc.
  • Resource type - an indication to the type of educational resource, such as lab exercises and tutorials, etc.
  • Audience - grade range of the resource
  • Copyright - copyright statement and any other restricted usage or lack thereof about the cataloged resource
  • Cost - indication as to whether there is a cost associated with accessing or using the resource
  • Resource creator - contact information for the author or publisher of a resource
  • Resource cataloger - contact information for the cataloger of a resource


Required metadata: Collection builder provided

  • Language of the resource - the language of the resource
  • Language of the metadata - the language of the metadata or catalog record
  • Copyright of the metadata - an indication as to the ownership of the metadata
  • Terms of use - an indication as to how the metadata may be used
  • Metadata framework - the metadata scheme used to catalog the resource; there is a default value: ADN (ADEPT/DLESE/NASA Alexandria Digital Earth Prototype/Digital Library for Earth System Education/National Aeronautics and Space Administration)
  • Creation date - the creation date of the metadata record
  • Accession date - the accession date of the item in to the collection builder's collection
  • Catalog name and number - an identifying name like DLESE and an identification number for the metadata record like a library call number
  • Record status - indicates the status of the record within a collection, such as accessioned, working, deaccessioned etc.


Robust metadata

All other metadata not included as required metadata is considered optional/suggested/robust metadata. Some examples include:

  • Coverage (spatial and temporal)
  • Science standards
  • Geography standards
  • Relationships between resources
  • Keywords
  • Additional technical information
  • Interactivity type
  • Interactivity level
  • Typical learning time
  • Duration of the resource
  • Size of the resource
  • Whom is the resource used by
  • Whom does the resource benefit
  • Instructional goal

Tool support to create required metadata

Features and constraints

  • Offline and online resources can be cataloged
  • Different vocabularies can be valid for the same field. Multiple vocabularies for the same field are allowed after rigorous review and registration.
  • The presence and some validity of required metadata can be immediately detected
  • Detailed geospatial geometries can be described
  • Contains educational fields (e.g. who uses the resource, who benefits from the resource, what is a possible teaching method and what is the instructional goal)
  • Places (San Diego, CA) and events (Hurricane Andrew) are separate entities available for searching
  • Time, other than AD, can be described (i.e. can say something like billions of years ago or 2500 BC
  • If an element is part of DLESE required metadata but does not have a controlled vocabulary, it must appear in a record.
  • If an element is part of DLESE required metadata and has a controlled vocabulary, it must appear in a record with at least the default value for the particular vocabulary.
  • If an element is not part of required metadata but has a controlled vocabulary, it should only appear in a record if the element has content and that content must be from the controlled vocabulary; a default choice is not allowed.
  • If an element is not part of required metadata and does not have a controlled vocabulary, it only appears in the record if the element has content.


Last updated: 12-16-04