RDFWeb and Friend of a Friend (FOAF): mobile meta?

June 26, 2003

mobile meta?

if the photo software in this p800 camera-phone knew how to talk to a bluetooth GPS, ...

someday... foaf + location + photos ...

not yet... when?

Posted by danbri at June 26, 2003 11:21 PM | TrackBack

Comments

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I found a Japanese who made FOAF fortune-telling vocabulary.

Posted by: jouno on June 30, 2003 07:01 PM

hi dan

i like that idea. but there is maybe a way around a GPS, if you do not really need such a good resolution. our telcos deliver a braodcast message with the position of the closest antenna or at least the one, with the best signal as far as i know. some of my thought here:

- http://www.circle.ch/blog/p970.html
- http://www.circle.ch/blog/p974.html

-urs

Posted by: urs on July 18, 2003 12:17 PM

I'm writing an article on the subject about to be published next week.
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This variable is then used in various lines of code, holding values given it by variable assignments along the way. In the course of its life, a variable can hold any number of variables and be used in any number of different ways. This flexibility is built on the precept we just learned: a variable is really just a block of bits, and those bits can hold whatever data the program needs to remember. They can hold enough data to remember an integer from as low as -2,147,483,647 up to 2,147,483,647 (one less than plus or minus 2^31). They can remember one character of writing. They can keep a decimal number with a huge amount of precision and a giant range. They can hold a time accurate to the second in a range of centuries. A few bits is not to be scoffed at.

Posted by: Blanche on January 20, 2004 08:11 AM

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:

Posted by: Howell on January 20, 2004 08:11 AM

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.

Posted by: Roland on January 20, 2004 08:12 AM

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.

Posted by: Josias on January 20, 2004 08:12 AM

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

Posted by: Elizabeth on January 20, 2004 08:12 AM

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.

Posted by: Heneage on January 20, 2004 08:12 AM

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.

Posted by: Simon on January 20, 2004 08:12 AM

We can see an example of this in our code we've written so far. In each function's block, we declare variables that hold our data. When each function ends, the variables within are disposed of, and the space they were using is given back to the computer to use. The variables live in the blocks of conditionals and loops we write, but they don't cascade into functions we call, because those aren't sub-blocks, but different sections of code entirely. Every variable we've written has a well-defined lifetime of one function.

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Posted by: Chroseus on January 20, 2004 08:13 AM

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.

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