diff --git a/src/main/java/org/gcube/informationsystem/impl/AccessPolicyImpl.java b/src/main/java/org/gcube/informationsystem/impl/AccessPolicyImpl.java
new file mode 100644
index 0000000..899ef61
--- /dev/null
+++ b/src/main/java/org/gcube/informationsystem/impl/AccessPolicyImpl.java
@@ -0,0 +1,40 @@
+/**
+ * 
+ */
+package org.gcube.informationsystem.impl;
+
+import org.gcube.informationsystem.model.AccessPolicy;
+import org.gcube.informationsystem.model.ValueSchema;
+
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+
+/**
+ * @author Luca Frosini (ISTI - CNR) http://www.lucafrosini.com/
+ */
+public class AccessPolicyImpl implements AccessPolicy {
+
+	@JsonDeserialize(as = ValueSchemaImpl.class)
+	protected ValueSchema policy;
+	protected String note;
+	
+	@Override
+	public ValueSchema getPolicy() {
+		return this.policy;
+	}
+
+	@Override
+	public void setPolicy(ValueSchema policy) {
+		this.policy = policy;
+	}
+
+	@Override
+	public String getNote() {
+		return this.note;
+	}
+
+	@Override
+	public void setNote(String note) {
+		this.note = note;
+	}
+
+}
diff --git a/src/main/java/org/gcube/informationsystem/impl/ValueSchemaImpl.java b/src/main/java/org/gcube/informationsystem/impl/ValueSchemaImpl.java
new file mode 100644
index 0000000..4468636
--- /dev/null
+++ b/src/main/java/org/gcube/informationsystem/impl/ValueSchemaImpl.java
@@ -0,0 +1,39 @@
+/**
+ * 
+ */
+package org.gcube.informationsystem.impl;
+
+import java.net.URI;
+
+import org.gcube.informationsystem.model.ValueSchema;
+
+/**
+ * @author Luca Frosini (ISTI - CNR) http://www.lucafrosini.com/
+ *
+ */
+public class ValueSchemaImpl implements ValueSchema {
+
+	protected String value;
+	protected URI schema;
+	
+	@Override
+	public String getValue() {
+		return this.value;
+	}
+
+	@Override
+	public void setValue(String value) {
+		this.value = value;
+	}
+
+	@Override
+	public URI getSchema() {
+		return this.schema;
+	}
+
+	@Override
+	public void setSchema(URI schema) {
+		this.schema = schema;
+	}
+
+}
diff --git a/src/main/java/org/gcube/informationsystem/impl/utils/Entities.java b/src/main/java/org/gcube/informationsystem/impl/utils/Entities.java
new file mode 100644
index 0000000..56ff665
--- /dev/null
+++ b/src/main/java/org/gcube/informationsystem/impl/utils/Entities.java
@@ -0,0 +1,67 @@
+package org.gcube.informationsystem.impl.utils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.Reader;
+import java.io.Writer;
+
+import com.fasterxml.jackson.core.JsonGenerationException;
+import com.fasterxml.jackson.core.JsonParseException;
+import com.fasterxml.jackson.databind.JsonMappingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/**
+ * @author Luca Frosini (ISTI - CNR) http://www.lucafrosini.com/
+ */
+public class Entities {
+	
+	protected static final ObjectMapper mapper = new ObjectMapper();
+
+	/**
+	 * Write the serialisation of a given resource to a given stream.
+	 * @param resource the resource
+	 * @param stream the stream in input
+	 * @throws IOException 
+	 * @throws JsonMappingException 
+	 * @throws JsonGenerationException 
+	 */
+	public static <T extends OutputStream> T marshal(Object resource,T stream) throws JsonGenerationException, JsonMappingException, IOException {
+		mapper.writeValue(stream, resource);
+		return stream;
+	}
+	
+	/**
+	 * Write the serialisation of a given resource to a given character stream.
+	 * @param resource the resource
+	 * @param stream the stream in input
+	 * @throws IOException 
+	 * @throws JsonMappingException 
+	 * @throws JsonGenerationException 
+	 */
+	public static <T extends Writer> T marshal(Object resource,T stream) throws JsonGenerationException, JsonMappingException, IOException {
+		mapper.writeValue(stream, resource);
+		return stream;
+	}
+	
+	
+	
+	public static <T> T unmarshal(Class<T> resourceClass, Reader reader) throws JsonParseException, JsonMappingException, IOException {
+		return mapper.readValue(reader, resourceClass);
+	}
+
+	/**
+	 * Creates a resource of given class from its serialisation in a given {@link InputStream}.
+	 * @param resourceClass the class of the resource
+	 * @param stream the stream
+	 * @return the resource
+	 * @throws IOException 
+	 * @throws JsonMappingException 
+	 * @throws JsonParseException 
+	 */
+	public static <T> T unmarshal(Class<T> resourceClass, InputStream stream) throws JsonParseException, JsonMappingException, IOException {
+		return mapper.readValue(stream, resourceClass);
+	}
+	
+	
+}