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  public void contributeService( DeploymentContext context, Service service ) throws Exception {
    List<ServiceParamDescriptor> params = null; // Default if null, otherwise map of per provider role map of name/value pairs.  
    ResourceDescriptor resource = context.addResource()
    resource.role( "WEBHDFS" );
    resource.pattern( "webhdfs/v1/**?**" );
    context.contributeChain( service, resource, params );
  }

  public void contributeService( DeploymentContext context, Service service ) throws Exception {
    UrlRewriteRulesDescriptor serviceRules = loadRulesFromClassPath();
    UrlRewriteRulesDescriptor clusterRules = context.getDescriptor( "rewrite" );
    clusterRules.addRules( serviceRules );

    ResourceDescriptor resource;
    List<ServiceParamDescriptor> params;

    resource = context.getGatewayDescriptor().addResource();
    resource.role( "WEBHDFS" );
    resource.pattern( "webhdfs/v1/?**" );
    resource.pattern( "webhdfs/v1/**?**" );
    params = new ArrayList<ServiceParamDescriptor>();
    params.add( resource.createParam().role( "rewrite", "request.url", "/webhdfs/namenode/inbound/path" );
    params.add( resource.createParam().role( "rewrite", "response.headers", "/webhdfs/namenode/outbound/headers" );
    context.contributeChain( service, resource, params );

    resource = context.getGatewayDescriptor().addResource();
    nameNoderesource.role( "WEBHDFS" );
    nameNoderesource.pattern( "webhdfs/data/v1/**?**" );
    params = new ArrayList<ServiceParamDescriptor>();
    params.add( resource.createParam().role( "rewrite", "request.url", "/webhdfs/datanode/inbound/path" );
    context.contributeChain( service, resource, params );
  }

<topology>

  <gateway>

    <provider>
      <role>...</role>
      <name>...</name>
      <!-- Config for the provider. -->
      <param><name>...</name><value>...</value></param>
    </provider>

    <!-- NOTE: There will be a "built-in" "default" chain definition. -->  
    <chain>
      <name>...</name>
      <provider-ref>
        <role>...</role>
        <name>...</name>
        <!-- Config for the provider to override those in the provider. -->
        <param><name>...</name><value>...</value></param>
      </provider-ref>
      <provider-ref>...</provider-ref>
    </chain>
    <chain>...</chain>

  </gateway>

  <service>
    <role>...</role>
    <url>...</url>
    <chain-ref>
      <name>...</name>
      <!-- Config for the provider to override those in the chain. -->
      <param><role></role><name></name><value></value></param>
    </chain-ref>
    <!-- Config for the service. -->
    <param><name></name><value></value></param>
  </service>

</topology>