Leslie - At Beinecke Library, we have implemented a form of a
"backward" link from EAD instances to our OPAC.
We started doing this in EAD Beta, and even though we have
written specs for our migration to 1.0, we haven't located a
specific tag for the link. (If there is one intended for this,
I would also like to know.)
Anyway, here's how we do the linking.
In the front matter of our finding aids, we have three external
entities that are declared for each instance.
Two of them, a standard copyright declaration, and a
"More information about using this SGML file" explanatory
screen are the same for all instances.
Both of these are simple HTML files that are called
using the EXTREF tag with the ENTITYREF attribute referencing
an entity declared in the subdeclaration at the beginning of the instance.
The link to our catalog file is marked the same way,
but the syntax of the declared entity is more complex
and each instance points to its own unique catalog record.
To do this, you must confirm how to query your OPAC correctly,
which can involve a complicated search string.
We do so (we use a flavor of NOTIS) by referencing the
NOTIS record key. This only works because our OPAC
indexes by record key. You could configure your entire EAD
markup to point to a record in your OPAC and stall because
the OPAC hasn't been set to do this type of indexing.
So here's an example from a 1.0 instance -
first the entity declarations, and then the markup from the body of the
<!DOCTYPE EAD PUBLIC "-//Society of American Archivists//DTD ead.dtd
(Encoded Archival Description (EAD) Version 1.0)//EN" "ead.dtd"
[<!ENTITY brblmain SYSTEM "../otdf/brblmain.gif" NDATA gif>
<!ENTITY extptr SYSTEM
"http://www.library.yale.edu/beinecke/manuscript/extptr.htm" NDATA HTML>
<!ENTITY copyrite SYSTEM
"http://www.library.yale.edu/beinecke/manuscript/copyrite.htm" NDATA HTML>
<!ENTITY catalog SYSTEM
<?STYLESPEC "Beinecke Library Style Sheet" "../otdf/beinecke.ssh">
<?NAVIGATOR "Beinecke Library Navigator" "../otdf/beinecke.nav">
. . . .
Copyright © 1987 by the Yale University Library.</extref></p>
More information about using this SGML file</extref></p>
These NOTE tags are nested under EAD / ARCHDESC
following a DID which includes our extent statement (boxes, linear feet, etc.)
Beinecke Rare Book and Manuscript Library
New Haven, CT 06520
At 09:47 AM 2/5/99 -0500, you wrote:
>Is there a standard place within EAD to put a link to a local on-line
>system number? We are looking ahead to the implementation of our new
>on-line catalog, when it should be possible for us not only to link from
>it (the collection-level AMC record) to the finding aid, but also vice
>versa, from finding aid to collection-level record. We think this would
>be useful for those who enter the system through the finding aids
>database, but who might then want to look at the collection-level record
>(more than the <abstract> but less that all the finding aid).
>Is there a specific tag for this? We looked, and couldn't find one, nor
>did we find a tag that seems obvious to use with, for example, an
>ENCODINGANALOG attribute of >035.
>Has anyone implemented a finding aid to catalog record "backward" link,
>and if so, where did you put it?
>Chair, Harvard/Radcliffe Digital Finding Aids Project
>Leslie A. Morris
>Curator of Manuscripts in the Harvard College Library
>Houghton Library, Harvard University
>Cambridge, MA 02138
>e-mail: [log in to unmask]