Defining a new advanced metadata interceptor

Define an advanced metadata interceptor to inject model-compliant metadata into your XML content from property values stored in Alfresco. This metadata will be validated and set accordingly to a user-specified XSD model to ensure consistency in the XML content.

In the following steps you will be creating and/or configuring Spring beans in a Spring context file. A basic knowledge of Spring and the Spring Framework is required.

Note: Identifiers and namespaces in the samples below are used as examples. Make sure to replace them with identifiers and namespaces that match your development guidelines.

Open or create a new Spring context file.
Create an Advanced XPath Interceptor bean.
1. Use an existing XML schema filter reference to specify the document types for which the interceptor applies.
2. Define the properties of the bean.
  
  path
  
  a bean that defines the xpath and xmlSchema properties:
  
  xpath
  
  the XPath of an output node where the injected metadata will be stored
  
  xmlSchema
  
  an URI to the XSD model the injected metadata must comply with
  
  predicate
  
  Use the fully-qualified name with Clark notation as the value of the predicate.
  
  xmlSchemaFilter
  
  the DTD or XSD definition that will be used to filter out the document types for which the interceptor applies
```
<bean id="xmlns.rdf.interceptor.fromXsd.bookmap" parent="rdf.interceptor.xpath.advanced.abstract">
  <property name="path">
    <bean parent="rdf.interceptor.xpath.advanced.pathElementsFromXsd.abstract">
      <property name="xpath" value="/bookmap/booktitle/mainbooktitle" />
      <property name="xmlSchema" value="urn:oasis:names:tc:dita:xsd:bookmap.xsd" />
    </bean>
  </property>
  <property name="predicate" value="{sample}mainbooktitle" />
  <property name="xmlSchemaFilter" ref="dita.schemas.bookMap" />
</bean>
```
Create an Alfresco RDF property interceptor bean.
```
<bean id="samples.propertyInterceptor.bookmap" parent="alfresco.rdf.propertyInterceptor.abstract">
  <property name="property" value="{sample}mainbooktitle" />
</bean>
```
The Alfresco RDF property interceptor bean will have Componize listen for update events on the specified properties and react by rewriting the content if needed.
Restart the application server for your changes to take effect.

Whenever a property is modified in Alfresco for a document of the specified DTD or XSD, the property value will be automatically injected into the XML content at the defined XPath location.

Note: The injection occurs asynchronously. All policies and content rules are deactivated on the node during injection.