[jira] Commented: (NUTCH-185) XMLParser is configurable xml parser plugin.

["Jayant Kumar Gandhi (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/NUTCH-185?page=comments#action_12449103 ] 
            
Jayant Kumar Gandhi commented on NUTCH-185:
-------------------------------------------

Rida has made an ultimate plugin here. Must have for all people who need to use custom plugin to allow indexing/searching of various fields.
I have successfully got this plugin to work on both 0.7.2 and 0.8.1 version of Nutch.

I have a problem similar to Philippe Eugene above. I have a structure of xml similar to
<tags>
 <tag>tag1</tag>
 <tag>tag2</tag>
 <tag>tag3</tag>
<tags>

If I have the configuration as

<field name="tag" xpath="//Tags/Tag" type="Keyword" boost="1.3" />

The plugin just insert one value for 'tag' and combines all the values and makes a single entry for 'tag'. This makes the content unsearchable by tags are we must give all tags as the whole thing "tag1 tag2 tag3" becomes a keyword.

Instead if I have the configuration as:
<field name="tag" xpath="//Tags/Tag[1]" type="Keyword" boost="1.3" />
<field name="tag" xpath="//Tags/Tag[2]" type="Keyword" boost="1.3" />
<field name="tag" xpath="//Tags/Tag[3]" type="Keyword" boost="1.3" />
...
...

I get the same problem as Philippe, of only having the last value in the index => tag = tag3 will be stored in the index.
I.'m not sure that the problem is on the plugin or is my XPath incorrect. I dont know java much, I am still trying to debug the code to find the cause and solution.

> XMLParser is configurable xml parser plugin.
> --------------------------------------------
>
>                 Key: NUTCH-185
>                 URL: http://issues.apache.org/jira/browse/NUTCH-185
>             Project: Nutch
>          Issue Type: New Feature
>          Components: fetcher, indexer
>    Affects Versions: 0.7.2, 0.8.1, 0.8
>         Environment: OS Independent
>            Reporter: Rida Benjelloun
>         Attachments: parse-xml.patch, parse-xml.zip, parse-xml.zip
>
>
> Xml parser  is configurable plugin. It use XPath and namespaces to do the mapping between the XML elements and Lucene fields. 
> Informations :
> 1- Copy "xmlparser-conf.xml" to the nutch/conf dir
> 2- To index your custom XML file, you have to modify the "xmlparser-conf.xml". 
> This parser uses namespaces and XPATH to parse XML content
> The config file do the mapping between the XML noeds (using XPATH) and lucene field. 
> Example : <field name="dctitle" xpath="//dc:title" type="Text" boost="1.4" /> 
> 3- The xmlIndexerProperties encapsulate a set of fields associated to a namespace. 
> If the namespace is found in the xml document, the fields represented by the namespace will be indexed.
> Example : 
> <xmlIndexerProperties type="filePerDocument" namespace=" http://purl.org/dc/elements/1.1/">
>   <field name="dctitle" xpath="//dc:title" type="Text" boost=" 1.4" /> 
>   <field name="dccreator" xpath="//dc:creator" type="keyword" boost=" 1.0" /> 
> </xmlIndexerProperties>
> 4- It is possible to define a default namespace that will be applied when the parser 
> didn't find any namespace in the document or when the namespace found in the xml document doesn't match with the namespace defined in the xmlIndexerProperties. 
> Example :
> <xmlIndexerProperties type="filePerDocument" namespace="default">
>   <field name="xmlcontent" xpath="//*" type="Unstored" boost="1.0" /> 
> </xmlIndexerProperties>

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