2010/4/16 Rees, John (NIH/NLM) [E] <[log in to unmask]>:
> That said my brief experience, along with some
> hearsay, is that SOLR has trouble with deeply hierarchical data. It is
> pretty easy to index at the archdesc level but once you get into the dsc all
> that inheritance business doesn’t fare so well.
I'm not sure if this is really something that's Solr-specific,
however. The inheritance within EAD is primarily conceptual and
thereby implicit. We don't really have a well-defined data model for
archival description that provides a reliable way to derive that
information from the hierarchy.
2010/4/16 Király Péter <[log in to unmask]>:
> I guess, that the main problem is not how to maintain hierarchy (in a
> previous email
> I describe techniques). The main problem is the hierarchy-based search,
> like: I
> would like to retrieve those records with title X, which are the decendants
> records with author Y. The problem is, that in Solr there is no JOIN-like
While it's been a while since I looked at their implementation, I
believe New York University splits their EAD finding aids into
multiple documents, with one for the high-level information and the
rest for each component level. This information is then loaded
dynamically upon request in the interface. 
I'm also curious if anyone has tried an approach using XML Lucene
payloads in Solr.  It appears that University of Alberta was trying
this approach for providing page-level access to texts in TEI.
2010/04/19 Ethan Gruber <[log in to unmask]>:
> As an addendum to this conversation and to address Mark's concerns about
> indexing strategies/best practices, I think that there can be no standard
> approach to indexing EAD data. What you index is dependent upon your user
> interface specifications.
I agree, but I think I was specifically trying to distinguish between
UI needs for the discovery system vs. UI needs for the presentation
system. I understand that the two might be fairly interconnected, but
I still se a pretty strong distinction between the two.
Mark A. Matienzo
Digital Archivist, Manuscripts and Archives
Yale University Library