--- src/ooxml/java/org/apache/poi/POIXMLDocument.java	(revision 802651)
+++ src/ooxml/java/org/apache/poi/POIXMLDocument.java	(working copy)
@@ -17,7 +17,10 @@ 
 package org.apache.poi;
 
 import java.io.*;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
+import java.util.Set;
 
 import org.apache.poi.poifs.common.POIFSConstants;
 import org.apache.poi.util.IOUtils;
@@ -53,6 +56,13 @@ 
         this.pkg = pkg;
     }
 
+    public void load(POIXMLFactory factory) throws IOException, OpenXML4JException {
+    	Map<PackagePart, POIXMLDocumentPart> context = new HashMap<PackagePart, POIXMLDocumentPart> ();
+    	read(factory, context);
+    	onDocumentRead();
+    	context.clear();
+    }
+    
     /**
      * Wrapper to open a package, returning an IOException
      *  in the event of a problem.
@@ -207,5 +217,21 @@ 
 
         getPackage().save(stream);
     }
+	
+    /**
+     * Write out this document to an Outputstream.
+     *
+     * @param stream - the java OutputStream you wish to write the XLS to
+     *
+     * @exception IOException if anything can't be written.
+     */
+    public final void write(OutputStream stream, Set<PackagePart> alreadySaved) throws IOException {
+    	//force all children to commit their changes into the underlying OOXML Package
+    	onSave(alreadySaved);
 
+        //save extended and custom properties
+        getProperties().commit();
+    	
+    	getPackage().save(stream);
+    }
 }
--- src/ooxml/java/org/apache/poi/POIXMLDocumentPart.java	(revision 802651)
+++ src/ooxml/java/org/apache/poi/POIXMLDocumentPart.java	(working copy)
@@ -19,7 +19,8 @@ 
 import java.io.IOException;
 import java.util.LinkedList;
 import java.util.List;
-import java.net.URI;
+import java.util.Map;
+import java.util.Set;
 
 import org.apache.xmlbeans.XmlOptions;
 import org.apache.poi.util.POILogger;
@@ -180,6 +181,20 @@ 
     }
 
     /**
+     * Save changes in the underlying OOXML package.
+     * Recursively fires {@link #commit()} for each package part
+     */
+    protected final void onSave(Set<PackagePart> alreadySaved) throws IOException{
+    	commit();
+    	alreadySaved.add(this.getPackagePart());
+    	for(POIXMLDocumentPart p : relations){
+    		if (!alreadySaved.contains(p.getPackagePart())) {
+    			p.onSave(alreadySaved);
+    		}
+    	}
+    }
+
+    /**
      * Create a new child POIXMLDocumentPart
      *
      * @param descriptor the part descriptor
@@ -258,6 +273,29 @@ 
         }
     }
 
+    protected final void read(POIXMLFactory factory, Map<PackagePart, POIXMLDocumentPart> context) throws OpenXML4JException {
+    	PackageRelationshipCollection rels = packagePart.getRelationships();
+    	for (PackageRelationship rel : rels) {
+    		if(rel.getTargetMode() == TargetMode.INTERNAL){
+    			PackagePartName relName = PackagingURIHelper.createPartName(rel.getTargetURI());
+    			PackagePart p = packagePart.getPackage().getPart(relName);
+    			if(p == null) {
+    				logger.log(POILogger.ERROR, "Skipped invalid entry " + rel.getTargetURI());
+    				continue;
+    			}
+    			if (!context.containsKey(p)) {
+    				POIXMLDocumentPart childPart = factory.createDocumentPart(rel, p);
+    				context.put(p, childPart);
+    				childPart.parent = this;
+    				addRelation(childPart);
+    				if(p.hasRelationships()) childPart.read(factory, context);
+    			}
+    			else {
+    				addRelation(context.get(p));
+    			}
+    		}
+    	}
+    }
 
     /**
      * Fired when a new package part is created