Date Valid is for describing a resource that has date-sensitive
information. Examples are a train schedule which is only valid beginning
on a certain date or a law that will go into effect on a given date.

On the second question, I was going to answer the same way that Suzanne
did. The record describes a given resource with an identifier. The
resource was accessed on a particular date and is being described in terms
of how it appeared on that date. So is there really a need to link them?
The only situation I can think of when you might want to associate the
date with an identifier is if you are giving more than one URI and you
accessed them on different dates-- maybe a mirror site or something. If
people think it important to enable linking the dateAccessed with the
identifier, we could use the ID and IDref constructs available in XML as
attributes to dateAccessed and Identifier, which would provide a linking


On Thu, 28 Aug 2003, Bruce D'Arcus wrote:

> On Thursday, August 28, 2003, at 05:18  PM, Rebecca S. Guenther wrote:
> > It has been suggested that MODS include a date of access. The example
> > given was for bibliographic citations. The Chicago Manual of Style
> > includes an access date for an electronic resource (i.e. date it was
> > last accessed, since Web sites change frequently) in standard
> > bibliographic citations. This is different from dateModified, which is
> > being added to MODS in version 3.0, in that dateModified tells you
> > date that the resource was last changed, while date accessed would
> > tell you when it was last viewed or accessed and makes no claims about
> > when it was last modified.
> What is the purpose of dateValid then?
> > Are there any thoughts about adding another date to MODS? Under
> > originInfo it would be dateAccessed. It then would use the dateType
> > definitions.
> Question: how would one then couple the access date with a specific
> URL, since each would be contained in different elements?
> Bruce