Re: [Aperture-devel] Date Handling

[Grant I. <gsi...@ap...>]

On Mar 19, 2008, at 5:32 AM, Christiaan Fluit wrote:

> Leo Sauermann wrote:
>> It was Grant Ingersoll who said at the right time 18.03.2008 16:41  
>> the
>> following words:
>>> I am still on the previous version of Aperture.  I am getting back
>>> several dates from the extractor, but there doesn't seem to be a way
>>> of distinguishing where they came from, as they all seem to be http://purl.org/dc/elements/1.1/date
>>>  objects.  I get a created predicate, which I assume is the create
>>> date of the file, and when I inspect the actual file, I can tell one
>>> of the dates is the lastModified date, but I am getting another date
>>> that I can't determine what it is.
>>>
>>> Does the new version have a way of specifying this at a finer grain
>>> level or is there a way to handle this in the version I am on?
>>>
>> The new version uses more precise ontologies,
>> www.semanticdesktop.org/ontologies
>>
>> which have multiple sub-properties of dates.
>>
>> you may want to give it a try for your datasource,
>> anyway, WHICH kind of thing you are crawling?
>
> I suspect that you are using both Crawlers and Extractors, right? The
> FileSystemCrawler adds the file's last modified date as known by the
> file system. Any Extractors applied on the DataObject can add dates
> reflecting the last modified dates contained *in* a file's metadata.
>
> The new namespaces do indeed have different properties so that you can
> see which is which, e.g. nfo:fileLastModified for the file system's  
> date
> and nie:contentLastModified and nie:contentCreated for dates inside  
> the
> file's internal metadata.
>

Is there anyway yet of knowing what all these values are for a given  
crawler?  I think my wiki attempts are already out of date.  This, to  
me, is one of the hardest parts about planning out use of Aperture.    
I'd help kick in on it, if someone can point me to where to start.

-Grant