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From Apache Wiki <wikidi...@apache.org>
Subject [Nutch Wiki] Update of "GoogleSummerOfCode/PrecisionDataExtractor" by AmmarShadiq
Date Fri, 29 Jan 2016 13:30:03 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Nutch Wiki" for change notification.

The "GoogleSummerOfCode/PrecisionDataExtractor" page has been changed by AmmarShadiq:
https://wiki.apache.org/nutch/GoogleSummerOfCode/PrecisionDataExtractor?action=diff&rev1=3&rev2=4

  A html page have a tree-like xml pattern with html tag as its branch and text as its node.
This branch and node could be extracted using XPath. XPath allowing us to select a certain
branch or node of an XML and therefore could be used to extract certain information and treat
it differently based on its content and the user requirements. Furthermore a web domain like
news website usually have a same html code structure for storing the information on its web
pages. This same html code structure could be parsed using the same XPath query and retrieve
the same content information element. All of the XPath query for selecting various content
could be stored on a XPath Configuration File.
  The purpose of nutch are for various web source, not all of the web page retrieved from
those various source have the same html code structure, thus have to be treated differently
using the correct XPath Configuration. The selection of the correct XPath configuration could
be done automatically using regex by matching the url of the web page with valid url pattern
for that xpath configuration. This automatic mechanism allow the user of nutch to process
various web page and get only certain information that user wants therefore making the index
more accurate and its content more flexible.
  
- == Mentor Comments ==
+ === Mentor Comments ===
  
- * Chris Mattmann - very cool! Why not just integrate Scrapy with Nutch as a plugin? Something
like parse-scrapy?
+  * Chris Mattmann - very cool! Why not just integrate Scrapy with Nutch as a plugin? Something
like parse-scrapy?
- 
+  * Ammar Shadiq - This means that the parse-scrapy plugin would communicate with external
Python program, is it ok? Then, my idea so far would be to call scrapy program each time nutch
encounters a URL and feed back the Scrapy output to parse-scrapy to be processed as a nutch
format.
  === Introduction ===
  To be added
  === Timeline: ===

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