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      h3 Welcome to the RDA Element Vocabularies in GitHub
      p
        | As of January 2014 the RDA Element Vocabularies are available in published form in the namespace
        a(href='http://rdaregistry.info') http://rdaregistry.info
        | . This new version of the elements has been
        | extensively rearranged and updated to reflect recent decisions by the Joint Steering Committee for the Development
        | of RDA (JSC).
      p
        | The published vocabularies are currently available in several sets which reflect the underlying FRBR conceptual
        | model. There is also a version for library and other users who prefer properties not constrained by FRBR. These
        | ‘unconstrained’ elements are in a separate set, but they have the same internal relationships as the elements in
        | the ‘constrained’ sets. The links to the published element sets below will take you to a page that will provide direct access to various representations of each Element Set. The number of elements in each set is given in brackets.
      ul
        li
          a(href='http://www.rdaregistry.info/Elements/c') Classes
          | (8)
        li
          a(href='http://www.rdaregistry.info/Elements/w') Work properties
          | (232)
        li
          a(href='http://www.rdaregistry.info/Elements/e') Expression properties
          | (236)
        li
          a(href='http://www.rdaregistry.info/Elements/m') Manifestation properties
          | (213)
        li
          a(href='http://www.rdaregistry.info/Elements/i') Item properties
          | (54)
        li
          a(href='http://www.rdaregistry.info/Elements/a') Agent properties
          | (226)
        li
          a(href='http://www.rdaregistry.info/Elements/u') Unconstrained properties
          | (698)
      p
        | The HTML pages for each Element hosted at the Open Metadata Registry, maintain a balance between human-friendly and machine-friendly identifiers, so you will see a mix
        | of identifiers with opaque numerics and more human readable labels. Documentation currently in preparation will
        | provide more explanation for these decisions and their intended utility. Note that the constrained elements are
        | related to their unconstrained versions so that data created in an RDA application can be re-used by a non-RDA
        | application.
      p
        | If you discover a problem with the representations of the vocabularies, or have a question, or even wish to engage in a philosophical or practical discussion, please
        a(href='https://github.com/RDARegistry/RDA-Vocabularies/issues') raise an issue!
      h5 What’s different from the previous version?
      p
        | The work on a draft version began in 2008, and since then a significant amount of discussion and learning has
        | occurred. The new RDA Vocabularies reflect that understanding.
      p
        | The draft version of the elements available at
        a(href='http://rdvocab.info') http://rdvocab.info
        | were never
        | officially published, so those elements will be deprecated and users and applications redirected to the current
        | official versions at
        a(href='http://rdaregistry.info') http://rdaregistry.info
        | .
      h5 What about the RDA value vocabularies?
      p
        | The RDA Value Vocabularies agreed by the JSC are published in the original namespace at
        a(href='http://rdvocab.info') http://rdvocab.info
        | . The JSC has no plans to move them to the new namespace, but
        | the situation will be reviewed in due course as part of the ongoing development of RDA documentation for users and
        | application developers. Any changes will be carried out with minimum disruption and will not affect the semantics
        | of the vocabulary concepts and terms.
      h5 Next Steps
      p
        | The JSC, Metadata Management Associates (MMA), and the American Library Association Publishing division will
        | continue to collaborate on extensions and refinements of the RDA element sets and value vocabularies. Some
        | additional functionality will be added to the RDA Vocabularies as improvements are made in the OMR software. We
        | are always happy to discuss current and future requirements of users or potential users of the vocabularies.
    | This is Blog Post #2