RDFWeb and Friend of a Friend (FOAF): Using foaf:weblog in your FOAF file

June 25, 2003

Using foaf:weblog in your FOAF file

Here's how to add a foaf:weblog property to a FOAF document.

Anywhere there is an element describing a Person (or for that matter a company, group etc), you can include a sub-element that mentions their weblog(s):

So, if you start out with markup like this:

(Nicole just asked me how to do this, so she gets to be the example...)

<foaf:Person>
  <foaf:name>Nicole Sullivan</foaf:name>
  <foaf:homepage rdf:resource="http://www.apocalypse.org/~nicole/"/>
</foaf:Person>

...and add a weblog property of the Person described, it should look like this:

<foaf:Person>
  <foaf:name>Nicole Sullivan</foaf:name>
  <foaf:homepage rdf:resource="http://www.apocalypse.org/~nicole/"/>
  <foaf:weblog rdf:resource="http://www.stubbornella.org/"/>
</foaf:Person>

It doesn't matter exactly where you put the foaf:weblog entry, so long as it is immediately 'inside' the foaf:Person element. You can have the foaf:homepage bit first, or foaf:img, foaf:workplaceHomepage etc. there too., all alongside each other in any order.

This same technique works if you are describing your friends and collaborators in a FOAF file; just add in a foaf:weblog property inside the foaf:Person section that describes them.

That's all there is to it. Your FOAF file now describes the address of your weblog, making it easier to find for FOAF and other Semantic Web tools.

Note that If you have multiple weblogs, list them each separately, one after another. Note also that each foaf:weblog described in FOAF has to be the weblog of one 'thing' (whether Person, Company or whatever). So describing collaboratively edited weblogs is a topic I'll come back to in a future article.

Posted by danbri at June 25, 2003 11:48 AM | TrackBack

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That gives us a pretty good starting point to understand a lot more about variables, and that's what we'll be examining next lesson. Those new variable types I promised last lesson will finally make an appearance, and we'll examine a few concepts that we'll use to organize our data into more meaningful structures, a sort of precursor to the objects that Cocoa works with. And we'll delve a little bit more into the fun things we can do by looking at those ever-present bits in a few new ways.

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Note first that favoriteNumbers type changed. Instead of our familiar int, we're now using int*. The asterisk here is an operator, which is often called the "star operator". You will remember that we also use an asterisk as a sign for multiplication. The positioning of the asterisk changes its meaning. This operator effectively means "this is a pointer". Here it says that favoriteNumber will be not an int but a pointer to an int. And instead of simply going on to say what we're putting in that int, we have to take an extra step and create the space, which is what does. This function takes an argument that specifies how much space you need and then returns a pointer to that space. We've passed it the result of another function, , which we pass int, a type. In reality, is a macro, but for now we don't have to care: all we need to know is that it tells us the size of whatever we gave it, in this case an int. So when is done, it gives us an address in the heap where we can put an integer. It is important to remember that the data is stored in the heap, while the address of that data is stored in a pointer on the stack.

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Being able to understand that basic idea opens up a vast amount of power that can be used and abused, and we're going to look at a few of the better ways to deal with it in this article.

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When a variable is finished with it's work, it does not go into retirement, and it is never mentioned again. Variables simply cease to exist, and the thirty-two bits of data that they held is released, so that some other variable may later use them.

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This is another function provided for dealing with the heap. After you've created some space in the Heap, it's yours until you let go of it. When your program is done using it, you have to explicitly tell the computer that you don't need it anymore or the computer will save it for your future use (or until your program quits, when it knows you won't be needing the memory anymore). The call to simply tells the computer that you had this space, but you're done and the memory can be freed for use by something else later on.

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This code should compile and run just fine, and you should see no changes in how the program works. So why did we do all of that?

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