[OAI-implementers] Using dates other than metadata record creation date for data provider "from" and "until" searches

Kat Hagedorn khage at umich.edu
Fri Apr 11 10:00:36 EDT 2008

I¹m not sure I agree. Any robust harvester software should be able to
*initially* harvest regardless of datestamp.

Problems such as network connectivity, etc. should be addressed in the
harvesting software to allow as close to seamless harvesting as possible.
For example, software should have a timeout feature that provides for
network issues (e.g., waits 1 minute before trying again). If robust
software is not able to handle these problems, it¹s most likely an issue on
the data provider side, in my experience.


On 4/11/08 5:53 AM, "Rob Tice" <rob.tice at k-int.com> wrote:

> Hi Lisa
> I find that it is always helpful to put yourself in the shoes of someone who
> wants to harvest your data.
> If the smallest record count that can be obtained from your system as the
> result of an initial OAI ListRecords request (including dates and/or sets) is
> very large, it can be quite difficult for harvesting systems to successfully
> complete an Œinitial population¹ from your data without other influences
> (network  connectivity, target response time, resumption token lifetime etc.)
> having an increasing bearing on the successful outcome of the harvest.  
> For example, having a repository containing 200,000 records, all dated the
> same day and not supporting a request granularity of less than 1 day makes
> initial population more difficult for any harvesting system J.
> I do not know how many records you have so this may not be an issue for you
> but I think it is worth bearing in mind.
> Cheers
> Rob
> From: oai-implementers-bounces at openarchives.org
> [mailto:oai-implementers-bounces at openarchives.org] On Behalf Of Frederic
> Sent: 11 April 2008 07:41
> To: lisa at issuelab.com
> Cc: oai-implementers at openarchives.org
> Subject: Re: [OAI-implementers] Using dates other than metadata record
> creation date for data provider "from" and "until" searches
> Hello,
> As far as I understand the OAI protocol, I would rather say that DateStamp is
> about the last time that your record has been updated (which then must reflect
> "create", "update" or "delete").
> When you will first register your archive into a Harvester, I guess the
> harvester will first get all records available. To do so, it will query your
> archive without the "from" and "to" parameter.
> Then, most of harvesters will run regularly some incremental harvesting to get
> the records modified, deleted or added since the previous harvest. To do so
> they will run the query with the "from" parameter.
> Kind regards,
> Fred
> Lisa M. Brooks a écrit :
> Hello - We're very close to launching our data provider. Before we do I have a
> question about date-stamps.
> I understand that the "from" and "until" dates used to request metadata
> records refer to the date that the metadata record was created. We are an
> archive of research works that date back to the 1980s (we will definitely get
> even older works into our archive as we move forward). To my mind it would be
> more helpful to folks if our record date-stamps reflect the date the research
> work in question was first published.
> My concern is that we introduce our repository and harvesters don't get the
> gist of the temporal scope of our collection because everything is
> date-stamped en masse with the date that we generate our metadata records
> (which, with luck, will be this Saturday).
> I hope I'm making sense! Just want to know if this is a big no-no, or if there
> are things to consider before doing something like this. Appreciate the
> insight of list participants.
> Thanks for reading -
> ~Lisa
> Lisa M. Brooks
> IssueLab - bringing nonprofit research into focus
> lisa at issuelab.org
> 773-649-1790
> http://www.issuelab.org
> _______________________________________________
> OAI-implementers mailing list
> List information, archives, preferences and to unsubscribe:
> http://www.openarchives.org/mailman/listinfo/oai-implementers

Kat Hagedorn 
OAIster/Metadata Harvesting Librarian
DLXS Bibliographic Class Coordinator
Digital Library Production Service
University of Michigan

email: khage at umich.edu
phone: 734-615-7618

More information about the OAI-implementers mailing list