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Subject: Re: An Evidentiary Model expressed in XML
From: wcstarks <wcsta...@gmail.com>
To: Open Ancestry <open-ancestry@googlegroups.com>
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The referenc Structural Class

<Reference>
The Reference entity provides references, which are either external,
or internal to a document.

External
There are at least two types of external references:
1) A link to a coverage of a collection
Among these, are ID in the case of a database, or URL.  Information
about the collection, such as the name, publisher, media type of the
collection would be obtained from the Collection entity.

2) A specific citation within a collection
The Reference entity provides the specific references within a
collection where the record (or document, or entry) may be found.  It
may not be necessary to refer directly to volumes, books, etc., as
these are maintained in the collection and in coverage entities above
the document record, to which entity this document is already linked
via the =93Link to a Collection=94 reference.  In this usage, the
Reference would typically be used at the document record level.

Internal
Reference is also useful to describe the layout of a document - to
indicate relative positions, or absolute positions of the data
elements within an original document.  It may be attached to a label,
or to an actual input item (variable).  Example of relative positions
would be Attribute types of =93Row=94 and =93Column,=94 or =93Row=94 and =
=93Item,=94
or larger structures such as =93Box.=94  In this particular case the
References may be nested to show sub-attributes, just as was
illustrated for Types, Roles and Labels.  For example, sub-rows and
sub-columns would be useful where a document shows two (or more) rows
of data within one row, column or box on the form.

Reference Structure:
<Reference type =3D [type value]>
  <Piece type =3D [type value] occurs =3D =931:M=94>
    <Form type =3D [type value] occurs =3D =931-M=94> . . . </Form>
  </Piece>
  <Reference occurs =3D =930:M=94> . . . </Reference>
</Reference>

Reference can also be used to do Source Citations from the Assertion