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<?xml version="1.0" encoding="utf-8"?>
<datastore-indexes  autoGenerate="true">
    <datastore-index kind="Person" ancestor="false" source="manual">
        <property name="lastName" direction="asc"/>
        <property name="height" direction="asc"/>
    </datastore-index>
</datastore-indexes>

import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.PreparedQuery;
import com.google.appengine.api.datastore.Query;
import com.google.appengine.api.datastore.Query.FilterOperator;

........................

	// Get the Datastore Service
	DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
	
	// The Query interface assembles a query
	Query q = new Query("Person");
	q.addFilter("lastName", Query.FilterOperator.EQUAL, "Mannir");
	q.addFilter("height", FilterOperator.GREATER_THAN_OR_EQUAL, 16);
	
	// PreparedQuery contains the methods for fetching query results
	// from the datastore
	PreparedQuery pq =  datastore.prepare(q);

	for(Entity result: pq.asIterable()){
		
		String firstName = (String) result.getProperty("firstName");
		String lastName = (String) result.getProperty("lastName");
		Long height = (Long) result.getProperty("height");
		resp.getWriter().println(lastName + " " + firstName + ", " + height.toString() + " inches tall");
		
	}