diff --git a/ndn-cpp/encoding/BinaryXMLStructureDecoder.h b/ndn-cpp/encoding/BinaryXMLStructureDecoder.h
index ad10fcf..58a595f 100644
--- a/ndn-cpp/encoding/BinaryXMLStructureDecoder.h
+++ b/ndn-cpp/encoding/BinaryXMLStructureDecoder.h
@@ -23,11 +23,26 @@
   int nBytesToRead;
 };
 
-const int ndn_BinaryXMLStructureDecoder_READ_HEADER_OR_CLOSE = 0;
-const int ndn_BinaryXMLStructureDecoder_READ_BYTES = 1;
+enum {
+  ndn_BinaryXMLStructureDecoder_READ_HEADER_OR_CLOSE,
+  ndn_BinaryXMLStructureDecoder_READ_BYTES
+};
 
 void ndn_BinaryXMLStructureDecoder_init(struct ndn_BinaryXMLStructureDecoder *self);
         
+/**
+ * Continue scanning input starting from self->offset to find the element end.  On return, you must check
+ *   self->gotElementEnd: If the end of the element which started at offset 0 is found, 
+ *   then self->gotElementEnd is 1 and self->offset is the length of the element.  Otherwise, self-forElementEnd is 0 
+ *   which means you should read more into input and call again.
+ * @param self pointer to the ndn_BinaryXMLStructureDecoder struct
+ * @param input the input buffer. You have to pass in input each time because the buffer could be reallocated.
+ * @param inputLength the number of bytes in input.
+ * @return 0 for success, else an error string
+ */
+const char *ndn_BinaryXMLStructureDecoder_findElementEnd
+  (struct ndn_BinaryXMLStructureDecoder *self, const unsigned char *input, unsigned int inputLength);
+
 #ifdef	__cplusplus
 }
 #endif