diff --git a/src/main/java/se/kb/oai/ore/AggregatedResource.java b/src/main/java/se/kb/oai/ore/AggregatedResource.java
index 928e545..edd1908 100644
--- a/src/main/java/se/kb/oai/ore/AggregatedResource.java
+++ b/src/main/java/se/kb/oai/ore/AggregatedResource.java
@@ -31,6 +31,8 @@ import java.net.URISyntaxException;
  */
 public class AggregatedResource extends AggregateBase {
 	
+	private String mimetype;
+	
 	/**
 	 * Create an <code>AggreagatedResource</code> with the specified id.
 	 * 
@@ -51,7 +53,24 @@ public class AggregatedResource extends AggregateBase {
 	public AggregatedResource(URI id) {
 		super(id);
 	}
-		
+	/**
+	 * Get the MIME type (if known) for this <code>AggreagatedResource</code>. 
+	 * 
+	 * @return the MIME type, or <code>null</code> if not known
+	 */
+	public String getMimeType() {
+		return mimetype;
+	}
+	
+	/**
+	 * Set the MIME type for this <code>AggreagatedResource</code>. 
+	 * 
+	 * @param mimetype the MIME type
+	 */
+	public void setMimeType(String mimetype) {
+		this.mimetype = mimetype;
+	}
+	
 	/**
 	 * Get an <code>InputStream</code> for the content held in this 
 	 * <code>AggreagatedResource</code>. 
diff --git a/src/main/java/se/kb/oai/ore/ResourceMapSerializer.java b/src/main/java/se/kb/oai/ore/ResourceMapSerializer.java
index fc01da5..41bc035 100644
--- a/src/main/java/se/kb/oai/ore/ResourceMapSerializer.java
+++ b/src/main/java/se/kb/oai/ore/ResourceMapSerializer.java
@@ -18,6 +18,7 @@ package se.kb.oai.ore;
 
 import java.io.File;
 import java.io.IOException;
+import java.io.OutputStream;
 
 import org.dom4j.Element;
 
@@ -35,16 +36,26 @@ import org.dom4j.Element;
  * @author Oskar Grenholm, National Library of Sweden
  */
 public interface ResourceMapSerializer {
+	
+	/**
+	 * Serialize the resource map to an <code>OutputStream</code>.
+	 * 
+	 * @param map a resource map
+	 * @param stream a stream to serialize to
+	 * 
+	 * @throws IOException
+	 */
+	public void serializeToStream(ResourceMap map, OutputStream stream) throws IOException;
 
 	/**
 	 * Serialize the resource map to the given file.
 	 * 
-	 * @param file a file
 	 * @param map a resource map
+	 * @param file a file
 	 * 
 	 * @throws IOException
 	 */
-	public void serializeToFile(File file, ResourceMap map) throws IOException;
+	public void serializeToFile(ResourceMap map, File file) throws IOException;
 	
 	/**
 	 * Serialize the resource map and return it as a <code>String</code>.
diff --git a/src/main/java/se/kb/oai/ore/impl/AtomConstants.java b/src/main/java/se/kb/oai/ore/impl/AtomConstants.java
index 8013bb7..ac1b15e 100644
--- a/src/main/java/se/kb/oai/ore/impl/AtomConstants.java
+++ b/src/main/java/se/kb/oai/ore/impl/AtomConstants.java
@@ -53,6 +53,7 @@ public class AtomConstants extends OREConstants {
 	public static final String LABEL = "label";
 	public static final String REL = "rel";
 	public static final String HREF = "href";
+	public static final String MIME_TYPE = "type";
 	
 	public static final String ORE_TERMS_URL = "http://www.openarchives.org/ore/terms/";
 	public static final String ORE_TERMS_REM_URL = "http://www.openarchives.org/ore/terms/ResourceMap";
diff --git a/src/main/java/se/kb/oai/ore/impl/AtomSerializer.java b/src/main/java/se/kb/oai/ore/impl/AtomSerializer.java
index eb75376..9a89a6b 100644
--- a/src/main/java/se/kb/oai/ore/impl/AtomSerializer.java
+++ b/src/main/java/se/kb/oai/ore/impl/AtomSerializer.java
@@ -117,6 +117,8 @@ public class AtomSerializer extends SerializerBase {
 
 			link = DocumentHelper.createElement(LINK);
 			link.addAttribute(REL, "alternate");
+			if (resource.getMimeType() != null)
+				link.addAttribute(MIME_TYPE, resource.getMimeType());
 			link.addAttribute(HREF, resource.getId().toString());
 			entry.add(link);
 			
diff --git a/src/main/java/se/kb/oai/ore/impl/SerializerBase.java b/src/main/java/se/kb/oai/ore/impl/SerializerBase.java
index a6a6b76..5240610 100644
--- a/src/main/java/se/kb/oai/ore/impl/SerializerBase.java
+++ b/src/main/java/se/kb/oai/ore/impl/SerializerBase.java
@@ -19,6 +19,7 @@ package se.kb.oai.ore.impl;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.OutputStream;
 
 import org.dom4j.Element;
 
@@ -33,10 +34,14 @@ import se.kb.xml.XMLUtils;
  */
 public abstract class SerializerBase implements ResourceMapSerializer {
 
-	public void serializeToFile(File file, ResourceMap map) throws IOException {
-		FileOutputStream out = new FileOutputStream(file);
-		XMLUtils.writeXmlTo(serializeToXml(map), out);
-		out.close();
+	public void serializeToStream(ResourceMap map, OutputStream stream) throws IOException {
+		XMLUtils.writeXmlTo(serializeToXml(map), stream);		
+	}
+	
+	public void serializeToFile(ResourceMap map, File file) throws IOException {
+		FileOutputStream stream = new FileOutputStream(file);
+		serializeToStream(map, stream);
+		stream.close();
 	}
 
 	public String serializeToString(ResourceMap map) throws IOException {
diff --git a/src/site/apt/examples.apt b/src/site/apt/examples.apt
index 91eaeb8..4daa3f7 100644
--- a/src/site/apt/examples.apt
+++ b/src/site/apt/examples.apt
@@ -27,8 +27,7 @@ Examples
 
 +-----+
 
-String baseurl = "http://magasin.kb.se:8080/oaiprovider/";
-OaiPmhServer server = new OaiPmhServer(baseurl);
+OaiPmhServer server = new OaiPmhServer("http://magasin.kb.se:8080/oaiprovider/");
 Record record = server.getRecord("oai:kb:1", "oai_dc");
 
 +-----+
@@ -125,7 +124,7 @@ serializer.serializeToFile(new File("atom.xml"), map);
 ResourceMap map = factory.getResourceMap("http://test.kb.se/atom.xml");
 
 // Add one more AggregatedResource to the Aggregation.
-map.getAggregation.addResource(aResource);
+map.getAggregation().addResource(aResource);
 
 // Set the modified date to now.
 map.setModified(new Date());