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[protege-discussion] Incremental Instance Loading

Thomas Russ tar at ISI.EDU
Tue Mar 25 15:26:46 PDT 2008

On Mar 25, 2008, at 5:54 AM, O'Neill, Dennis wrote:
> I agree on the usefulness of the DB backend for on-going management.
> I've taken a quick look at the Protégé source. Is there an  
> architecture/design document that describes the overall structure?  
> It seems that using the existing code that loads the .pins file  
> would be a good place to start, but it is not obvious where this is  
> done.

I personally wouldn't bother with pins format, but instead just pick  
something that I found easy to parse, either plain text or XML.  Then  
I would just go through that file and create the instances and assign  
property values, using the standard API functions to do the instance  
creation and property assignments.  See < 
 >.  For example:

    Cls c = KnowledgeBase.getCls("className");
    Instance i = KnowledgeBase.createInstance("instanceName", c);
    Slot s = KnowledgeBase.getSlot("slotName");
    Object value = ...;
    i.addOwnSlotValues(s, value);   // from Frame.


> Thanks,
> Dennis M. O'Neill
> Room 2069B
> doneill at
> (281) 236-5690
> -----Original Message-----
> From: protege-discussion-bounces at [mailto:protege-discussion-bounces at 
> ] On Behalf Of Thomas Russ
> Sent: Monday, March 24, 2008 8:09 PM
> To: User support for Core Protege and the Protege-Frames editor
> Subject: Re: [protege-discussion] Incremental Instance Loading
> On Mar 24, 2008, at 2:01 PM, O'Neill, Dennis wrote:
>> Samson,
>> It is not a case of needing to load instances on demand, but rather
>> to programmatically create them on demand from an external source.
>> For example, new oil wells are drilled in an oil field on a regular
>> basis. My Protégé system has complete information as of a certain
>> date (e.g., March 31, 2008). On April 30, I want to upload (new)
>> information about the wells that have been drilled in the month of
>> April. How can I load them into my existing knowledge base without
>> keying them in manually?
>> A "Load Instances" command (from a validly structured .pins file)
>> would serve the purpose quite nicely.
> Well, you could always build a plugin to do what you want.  Perhaps a
> tab plugin or just a plugin that adds a menu item.  You could then
> have your own custom Java code that reads a file of your choice and
> uses the Protege API to insert the new instances.  You would thus get
> complete control.
> Although the database for storing the instances sounds like it might
> be a good idea as well, since then you could do the incremental
> updates and let the DB backend worry about the persistence.
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