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https://issues.apache.org/jira/browse/NUTCH-978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13548624#comment-13548624
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Emmanuel Colin commented on NUTCH-978:
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Hi Lewis, thanks for your reply.
In fact I was suggesting that - in my opinion - the issue has been (very well)
addressed by the filter-xpath plugin described in the blog entry I pointed to.
Its approach for configuration leveraging the power of XPath queries is pretty
flexible (and well described by comments in the config file). I also tested the
plugin and it works fine.
What I would add for some more flexibility on the 'field' configuration markup
is: a 'locale' attribute to enable parsing of non English date formats; a
'fixedValue' attribute enabling to index fixed values into Solr for better
categorization when indexing specific datasets; a 'regexPattern' and a
'regexReplace' attributes to enable some regex based postprocessing of the data
extracted (for example to remove some unwanted prefix before the interesting
data).
With this, the plugin would be pretty powerful and useful to anyone wanting to
extract information from semistructured websites without writing their own
plugin.
> A Plugin for extracting certain element of a web page on html page parsing.
> ---------------------------------------------------------------------------
>
> Key: NUTCH-978
> URL: https://issues.apache.org/jira/browse/NUTCH-978
> Project: Nutch
> Issue Type: New Feature
> Components: parser
> Affects Versions: 1.2
> Environment: Ubuntu Linux 10.10; JDK 1.6; Netbeans 6.9
> Reporter: Ammar Shadiq
> Assignee: Chris A. Mattmann
> Priority: Minor
> Labels: gsoc2012, mentor
> Fix For: 2.2
>
> Attachments: app_guardian_ivory_coast_news_exmpl.png,
> app_screenshoot_configuration_result_anchor.png,
> app_screenshoot_configuration_result.png, app_screenshoot_source_view.png,
> app_screenshoot_url_regex_filter.png, for_GSoc.zip,
> [Nutch-GSoC-2011-Proposal]Web_Page_Scrapper_Parser_Plugin.pdf,
> version_alpha2.zip
>
> Original Estimate: 1,680h
> Remaining Estimate: 1,680h
>
> Nutch use parse-html plugin to parse web pages, it process the contents of
> the web page by removing html tags and component like javascript and css and
> leaving the extracted text to be stored on the index. Nutch by default
> doesn't have the capability to select certain atomic element on an html page,
> like certain tags, certain content, some part of the page, etc.
> 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 threated 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.
> The component for this idea have been tested on nutch 1.2 for selecting
> certain elements on various news website for the purpose of document
> clustering. This includes a Configuration Editor Application build using
> NetBeans 6.9 Application Framework. though its need a few debugging.
> http://dl.dropbox.com/u/2642087/For_GSoC/for_GSoc.zip
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