Aspects and MetadataExtraction

gonenc — Mon, 18 Sep 2006 12:06:46 GMT

Hi, Is it possible to do some metadata extraction from the content whenever an update, create or edit in a node's content occurs? My use case is that I have an Domain Specific Language in the form of XML. Whenever this type of XML is uploaded or updated I want to extract some data from the XML and a

Re: Aspects and MetadataExtraction

rmills — Wed, 03 Oct 2007 21:49:24 GMT

Let me make sure I understand you before I try to answer:
You have an xml you're extracting data from and applying a general aspect to. When you update the xml and add certain nodes, you want it to add new aspects? is that correct?

I'm not sure if this will work, but try using a few selectors. For example say you want the general aspect applied when the root node is MYROOT and the "sub-aspect" applied when MYROOT has a child PROPERTY


<bean id="extracter.xml.sample.selector.XPathSelector" class="org.alfresco.repo.content.selector.XPathContentWorkerSelector" init-method="init">
    <property name="workers">
      <map>
        <entry key="/MYROOT">
          <ref bean="extracter.xml.company.MYROOTXPathSelector"/>
        </entry>
      </map>
    </property>
  </bean>


<bean id="extracter.xml.company.MYROOTXPathSelector" class="org.alfresco.repo.content.selector.XPathContentWorkerSelector" init-method="init">
    <property name="workers">
      <map>
        <entry key="/MYROOT/PROPERTY">
          <ref bean="extracter.xml.company.PROPERTYMetadataExtractor/>
        </entry>
      </map>
    </property>
  </bean>

<bean id="extracter.xml.company.PROPERTYMetadataExtracter"
    class="org.alfresco.repo.content.metadata.xml.XPathMetadataExtracter"
    parent="baseMetadataExtracter"
    init-method="init" >
    <property name="mappingProperties">
      <bean class="org.springframework.beans.factory.config.PropertiesFactoryBean">
        <property name="properties">
          <props>
            <prop key="namespace.prefix.superaspect">http://www.company.com/alfresco/model/content/1.0/superaspect</prop>
            <prop key="namespace.prefix.subaspect">http://www.company.com/alfresco/model/content/1.0/subaspect</prop>
            <prop key="superaspect_title">superaspect:Title</prop>
   <prop key="subaspect_author">subaspect:Author</prop>
         </props>
        </property>
      </bean>
    </property>
    <property name="xpathMappingProperties">
      <bean class="org.springframework.beans.factory.config.PropertiesFactoryBean">
        <property name="properties">
          
          <props>
            <prop key="namespace.prefix.superaspect">http://www.company.com/alfresco/model/content/1.0/superaspect</prop>
            <prop key="namespace.prefix.subaspect">http://www.company.com/alfresco/model/content/1.0/subaspect</prop>
            <prop key="superaspect_title">/MYROOT/PROPERTY/Title</prop>
   <prop key="subaspect_author">/MYROOT/PROPERTY/Author</prop>
         </props>
        </property>
      </bean>
    </property>
  </bean>

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You'll have to create a bunch of different selectors and conditions but it should get you where you want. As for updating it when the content is updated, create Inbound and Update rules on the content space where the content is being stored to extract the data. It should run everytime you update the content and if you set up the extractors correctly, it shouldn't matter whether or not your mimetype is different from the standard XML mimetype.

Hope this helps some.

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Aspects and MetadataExtraction

Re: Aspects and MetadataExtraction