diff --git a/src/encoding/BinaryXMLDecoder.js b/src/encoding/BinaryXMLDecoder.js
new file mode 100644
index 0000000..4a8b1c4
--- /dev/null
+++ b/src/encoding/BinaryXMLDecoder.js
@@ -0,0 +1,89 @@
+var MARK_LEN=512;
+var DEBUG_MAX_LEN =  32768;
+
+var BinaryXMLDecoder = new BinaryXMLDecoder(_Istream){
+	this.Istream = _Istream;
+	
+};
+
+
+BinaryXMLDecoder.prototype.readStartElement =function(
+	//String
+	startTag,				    
+	//TreeMap<String, String>
+	attributes) {
+
+	try {
+		BinaryXMLCodec.TypeAndVal tv = BinaryXMLCodec.decodeTypeAndVal(this.Istream);
+		
+		if (null == tv) {
+			throw new Exception("Expected start element: " + startTag + " got something not a tag.");
+		}
+		
+		String decodedTag = null;
+		
+		if (tv.type() == BinaryXMLCodec.XML_TAG) {
+			
+			decodedTag = BinaryXMLCodec.decodeUString(this.Istream, tv.val()+1);
+			
+		} else if (tv.type() == BinaryXMLCodec.XML_DTAG) {
+			decodedTag = tagToString(tv.val());	
+		}
+		
+		if ((null ==  decodedTag) || (!decodedTag.equals(startTag))) {
+			throw new Exception("Expected start element: " + startTag + " got: " + decodedTag + "(" + tv.val() + ")");
+		}
+		
+		if (null != attributes) {
+			readAttributes(attributes); 
+		}
+		
+	} catch (e) {
+		throw new Exception("readStartElement", e);
+	}
+};
+
+BinaryXMLDecoder.prototype.readAttributes = function(
+	//TreeMap<String,String> 
+	attributes){
+	
+	if (null == attributes) {
+		return;
+	}
+
+	try {
+
+		BinaryXMLCodec.TypeAndVal nextTV = BinaryXMLCodec.peekTypeAndVal(_istream);
+
+		while ((null != nextTV) && ((BinaryXMLCodec.XML_ATTR == nextTV.type()) ||
+				(BinaryXMLCodec.XML_DATTR == nextTV.type()))) {
+
+			BinaryXMLCodec.TypeAndVal thisTV = BinaryXMLCodec.decodeTypeAndVal(this.Istream);
+
+			var attributeName = null;
+			if (BinaryXMLCodec.XML_ATTR == thisTV.type()) {
+				
+				attributeName = BinaryXMLCodec.decodeUString(_istream, thisTV.val()+1);
+
+			} else if (BinaryXMLCodec.XML_DATTR == thisTV.type()) {
+				// DKS TODO are attributes same or different dictionary?
+				attributeName = tagToString(thisTV.val());
+				if (null == attributeName) {
+					throw new ContentDecodingException("Unknown DATTR value" + thisTV.val());
+				}
+			}
+			
+			var attributeValue = BinaryXMLCodec.decodeUString(_istream);
+
+			attributes.put(attributeName, attributeValue);
+
+			nextTV = BinaryXMLCodec.peekTypeAndVal(_istream);
+		}
+
+	} catch ( e) {
+
+		throw new ContentDecodingException("readStartElement", e);
+	}
+};
+
+//TODO
\ No newline at end of file