Strigi now understands Xesam queries

Flavio wrote about Strigi getting Xesam query support, which is cool and allows me to look up email from me to a friend using this query:

<request>
  <query>
  <and>
    <equals>
      <field name="email.to"/>
      <string>Christoph</string>
    </equals>
    <equals>
      <field name="email.from"/>
      <string>Egon</string>
    </equals>
  </and>
  </query>
</request>

So that, after having saved the above as query.xml, I can then issue a strigicmd call:

strigicmd xesamquery -t clucene -d index/ -q query.xml

Now, with proper nesting and all functional (see the full query language specification), I can do all sorts of nice queries:

<request>
  <query>
    <equals>
      <field name="xml.usesNamespace"/>
      <string caseSensitive="true">http://www.xml-cml.org/schema</string>
    </equals>
  </query>
</request>

Possibly embedded in XHTML (or vice versa):

<request>
  <query>
    <and>
      <equals>
        <field name="xml.usesNamespace"/>
        <string caseSensitive="true">http://www.xml-cml.org/schema</string>
      </equals>
      <equals>
        <field name="xml.usesNamespace"/>
        <string caseSensitive="true">http://www.w3.org/1999/xhtml</string>
      </equals>
    </and>
  </query>
</request>

And, after having installed strigi-chemical currently developed by Alexandr, the GSoC student on chemistry support for Strigi, chemical queries. For example, to get all molecules with a certain mass range, I can find all files that use a CML namespace:

<request>
  <query>
    <and>
      <greaterThan>
        <field name="chemistry.molecular_weight"/>
        <float>50</float>
      </greaterThan>
      <lessThan>
        <field name="chemistry.molecular_weight"/>
        <float>59</float>
      </lessThan>
    </and>
  </query>
</request>

Or, give me all chemical files which contains a molecule with 'butane' in the name:

<request>
  <query>
    <and>
      <contains>
        <field name="content.mime_type"/>
        <string>chemistry</string>
      </contains>
      <contains>
        <field name="chemistry.name"/>
        <string>butane</string>
      </contains>
    </and>
  </query>
</request>

GSoC Meeting with Alexandr

Yesterday I met with Alexandr to discuss things around his GSoC project, like time schedule etc. During the mentors meeting to work out the final rankings, one fellow mentor argued that this project is too specialized for KDE. We, therefore, discussed how we can maximize the effect on the rest of the KDE project, and ideas that came up include a dedicated query tool for complex data (such as chemical data). Anyway, this will be discussed in our blogs soon.



Meanwhile, I have registered to the new Planet SoC which was announced on the Summer of Code Blog.