Don't scrape, Glean!

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The document discusses scraping web pages for data and provides alternatives like using APIs and GRDDL. It notes that scraping can produce ugly code while APIs and GRDDL allow for cleaner separation of data from presentation and easier data transformation. The author provides examples of scraping code and promotes discussing these issues on IRC channels.

def lastlogin (@hmodel/ "//td[@class='text'][@width='193']" ).first.innerHTML.split("<br />"[ 9 ].strip[ -10 .. -1 ] return date[ -4 .. -1 ] + "-" + date[ -7 .. -6 ] + "-" + date[ -10 .. -9 ] end end end end

Hpricot for 鈥楲ast login鈥� date on MySpace.

$try : lastlogin = self.soup.findAll( True , { "width" : "193" })[ 0 ].br.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.string loginregex = re.compile( r " [0-9] / [0-9] +/ [0-9]* ") loginregex_inst = loginregex.search(lastlogin) if loginregex_inst is not None : self.lastlogin = loginregex_inst.group() except : pass pass pass pass pass pass pass pass$

Taken from a Python/BeautifulSoup library.

(The Ruby is prettier, but who鈥檚 counting?)

驳别迟贰濒别尘别苍迟蝉叠测颁濒补蝉蝉狈补尘别(鈥渇辞辞鈥�)摆0闭.肠丑颈濒诲谤别苍

It鈥檚 an edge case. MySpace鈥檚 HTML is worse than average.

But it is an ugly recipe for mental turmoil.

And you get back nice XML or JSON (or even SOAP!) (or even SOAP!)

But 鈥楧.R.Y.鈥�! APIs break that principle. APIs break that principle.

This is the data equivalent of the 鈥榓ccessible version鈥�.

GRDDL defines a transformation process for XHTML 禄 RDF.

XHTML ? That鈥檚 what the spec says. That鈥檚 what the spec says.

RDF? Yes. Trust me. It鈥檚 not evil. It鈥檚 not evil. It鈥檚 not evil.

GRDDL can work like a data stylesheet on top of your HTML. on top of your HTML. on top of your HTML.

You simply use HTML (or XML) in the normal way...

...and define how the data transformation.

You can even use it as a bridge for exisiting APIs and services.

Could even be used for other formats than RDF. Atom? than RDF. Atom? than RDF. Atom?

Simple example: 鈥楴ot Safe For Work鈥� 鈥楴ot Safe For Work鈥�

<a href=" http://tubgirl.com " class="nsfw">

I can write that. I can鈥檛 write xFolk by hand. I can鈥檛 write xFolk by hand.

The data layer becomes separated like CSS is from HTML.

That鈥檚 the theory. Now for the demo. Now for the demo.

irc.freenode.net #swig #swhack #swhack #swhack

getsemantic.com [email_address] [email_address]

[email_address] http://tommorris.org http://tommorris.org

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Don't scrape, Glean!

1. Don鈥檛 Scrape, Glean . . Tom Morris

2. Scraping sucks.

3. def lastlogin (@hmodel/ "//td[@class='text'][@width='193']" ).first.innerHTML.split("<br />"[ 9 ].strip[ -10 .. -1 ] return date[ -4 .. -1 ] + "-" + date[ -7 .. -6 ] + "-" + date[ -10 .. -9 ] end end end end

4. Hpricot for 鈥楲ast login鈥� date on MySpace.

5. try : lastlogin = self.soup.findAll( True , { "width" : "193" })[ 0 ].br.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.nextSibling.string loginregex = re.compile( r " [0-9] / [0-9] +/ [0-9]* ") loginregex_inst = loginregex.search(lastlogin) if loginregex_inst is not None : self.lastlogin = loginregex_inst.group() except : pass pass pass pass pass pass pass pass

6. Taken from a Python/BeautifulSoup library.

7. (The Ruby is prettier, but who鈥檚 counting?)

8. 驳别迟贰濒别尘别苍迟蝉叠测颁濒补蝉蝉狈补尘别(鈥渇辞辞鈥�)摆0闭.肠丑颈濒诲谤别苍

9. It鈥檚 an edge case. MySpace鈥檚 HTML is worse than average.

10. But it is an ugly recipe for mental turmoil.

11. The alternative?

12. flickr.getPhotos()

13. And you get back nice XML or JSON (or even SOAP!) (or even SOAP!)

14. But 鈥楧.R.Y.鈥�! APIs break that principle. APIs break that principle.

15. This is the data equivalent of the 鈥榓ccessible version鈥�.

16. Enter GRDDL.

17. GRDDL defines a transformation process for XHTML 禄 RDF.