This is a quick writeup of an application of RDF query tools to the problems of weblog discovery and filtering. It shows off RDF's ability to merge XML-encoded data from multiple sources, answering queries which couldn't be answered by considering each source separately.
Imagine you are looking for Weblog URLs (and perhaps their associated RSS feeds) of people who have written Perl software that is in CPAN. At our disposal are two data sources: a data dump listing the SHA1 hashes of CPAN author email addresses. For each author, we have an @cpan address, plus one of their normal addresses (cpan2foaf.pl). A second RDF/XML source of FOAF data is a document listing other information about several people who happen to write for CPAN. That file is a stand-in for their real FOAF files, which would typically be collected from each of their sites individually. For simplicity, we show that data as a single document.
The first datasource mentions several hundred people who contribute to CPAN, and enough information to identify them (by hash of email address). The second datasource contains some of the same identifiers (their hashed home email address) plus, more interestingly, information about their names, homepages, weblogs and suchlike. How can we get answers to questions like "find me weblog addresses for CPAN contributors?".
So... we load the RDF up into an (SQL-backed) RDF database, make sure to merge the data (more on which another time), and it is available for query.
Here's the SquishSQL query we send to the RDF software:
SELECT ?name, ?homepage, ?weblog, ?x, ?feed,
WHERE (foaf::name ?x ?name)
(dc::contributor ?x http://www.cpan.org/)
(foaf::homepage ?x ?homepage)
(foaf::weblog ?x ?weblog)
(foaf::rssfeed ?weblog ?feed)
USING dc for http://purl.org/dc/elements/1.1/
foaf for http://xmlns.com/foaf/0.1/
This RDF query language is called Squish as it is loosly SQL-ish in the way it is used. We send the database a question asking for a selection of fields, and we get back a table of results. Here are name/homepage/weblog 'hits' corresponding to the rows returned by the query system:
Earle Martin (http://downlode.org/ weblog: http://downlode.org/blog.pl) Jo Walsh (http://www.zooleika.org.uk weblog: http://www.zooleika.org.uk/blog.html) Norm Walsh (http://nwalsh.com/ weblog: http://norman.walsh.name/)
Here is a simple Ruby lookup script which extracts the tabular result set from the database. The query extracts information (in this case weblog address etc) about people who contribute to CPAN and are known to the database.
Bugs and disclaimers:
I used the dc:contributor property incorrectly in this demo. It should relate a document to one of its contributors. I used it backwards, and slightly incorrectly, by relating a person to a homepage of a project they contribute to. I should use foaf:project instead.
The demo links are also a bit inconsistent, in that I added in a clause to the query which also asks for the RSS feed of a weblog, but didn't commit the new resultset output to the website yet. I'll try to get that fixed.
This brief writeup assumes perhaps a bit too much background knowledge for those new to RDF to follow in detail, also things like SHA1 'hashing' could do with elaboration. Still I hope the basic approach is clear: RDF allows us to merge disparate datasources and get back answers that depend on their combination. And that we can use that for filtering and discovery of weblogs, given a description of some weblogs and their authors.
Posted by danbri at June 23, 2003 02:21 PM | TrackBackGreat_Blog_I_agree_with_you_completely
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Posted by: Bennett on January 20, 2004 07:56 AMLet's take a moment to reexamine that. What we've done here is create two variables. The first variable is in the Heap, and we're storing data in it. That's the obvious one. But the second variable is a pointer to the first one, and it exists on the Stack. This variable is the one that's really called favoriteNumber, and it's the one we're working with. It is important to remember that there are now two parts to our simple variable, one of which exists in each world. This kind of division is common is C, but omnipresent in Cocoa. When you start making objects, Cocoa makes them all in the Heap because the Stack isn't big enough to hold them. In Cocoa, you deal with objects through pointers everywhere and are actually forbidden from dealing with them directly.
Posted by: Peter on January 20, 2004 07:56 AMThese secret identities serve a variety of purposes, and they help us to understand how variables work. In this lesson, we'll be writing a little less code than we've done in previous articles, but we'll be taking a detailed look at how variables live and work.
Posted by: Adrian on January 20, 2004 07:56 AMThis will allow us to use a few functions we didn't have access to before. These lines are still a mystery for now, but we'll explain them soon. Now we'll start working within the main function, where favoriteNumber is declared and used. The first thing we need to do is change how we declare the variable. Instead of
Posted by: Court on January 20, 2004 07:57 AMThis 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?
Posted by: Wymond on January 20, 2004 07:57 AMWhen 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.
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Posted by: Timothy on January 20, 2004 07:57 AMThat 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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