RDFWeb and Friend of a Friend (FOAF)

foaf:weblog - great!

But what do you think the best way to point to the RSS 1.0 feed of the blog?

rdf:seeAlso seems to be in common use to point to other RDF files, but how best to combine this with foaf:weblog? Three alternatives spring to mind:

two statements (simple)

rdf:seeAlso -> http://example.com/feed.xml
foaf:weblog -> http://example.com/feed.xml

using blank node :

rdf:seeAlso -> bNode -> foaf:weblog -> http://example.com/feed.xml

I'm not sure what was planned for foaf:Document, how about

rdf:seeAlso -> foaf:Document -> foaf:weblog -> http://example.com/feed.xml

How about this ?

<foaf:weblog>
<foaf:Document rdf:about="http://example.org/weblog/">
<rdfs:seeAlso rdf:resource="http://example.com/feed.xml"/>
</foaf:Document>
</foaf:weblog>

But some variables are immortal. These variables are declared outside of blocks, outside of functions. Since they don't have a block to exist in they are called global variables (as opposed to local variables), because they exist in all blocks, everywhere, and they never go out of scope. Although powerful, these kinds of variables are generally frowned upon because they encourage bad program design.

This back and forth is an important concept to understand in C programming, especially on the Mac's RISC architecture. Almost every variable you work with can be represented in 32 bits of memory: thirty-two 1s and 0s define the data that a simple variable can hold. There are exceptions, like on the new 64-bit G5s and in the 128-bit world of AltiVec

But variables get one benefit people do not

Note the new asterisks whenever we reference favoriteNumber, except for that new line right before the return.

This back and forth is an important concept to understand in C programming, especially on the Mac's RISC architecture. Almost every variable you work with can be represented in 32 bits of memory: thirty-two 1s and 0s define the data that a simple variable can hold. There are exceptions, like on the new 64-bit G5s and in the 128-bit world of AltiVec

When Batman went home at the end of a night spent fighting crime, he put on a suit and tie and became Bruce Wayne. When Clark Kent saw a news story getting too hot, a phone booth hid his change into Superman. When you're programming, all the variables you juggle around are doing similar tricks as they present one face to you and a totally different one to the machine.

Earlier I mentioned that variables can live in two different places. We're going to examine these two places one at a time, and we're going to start on the more familiar ground, which is called the Stack. Understanding the stack helps us understand the way programs run, and also helps us understand scope a little better.

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.

The rest of our conversion follows a similar vein. Instead of going through line by line, let's just compare end results: when the transition is complete, the code that used to read:

But variables get one benefit people do not

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