diff -ru libxml2-2.9.0/include/libxml/xmlwriter.h libxml2-2.9.0-mine//include/libxml/xmlwriter.h
--- libxml2-2.9.0/include/libxml/xmlwriter.h	2012-09-05 13:14:55.000000000 +0200
+++ libxml2-2.9.0-mine//include/libxml/xmlwriter.h	2012-09-07 15:10:33.000000000 +0200
@@ -471,6 +471,10 @@
         xmlTextWriterSetIndentString(xmlTextWriterPtr writer,
                                      const xmlChar * str);
 
+    XMLPUBFUN int XMLCALL
+        xmlTextWriterSetQuoteChar(xmlTextWriterPtr writer, xmlChar quotechar);
+
+
 /*
  * misc
  */
diff -ru libxml2-2.9.0/xmlwriter.c libxml2-2.9.0-mine//xmlwriter.c
--- libxml2-2.9.0/xmlwriter.c	2012-09-07 06:11:25.000000000 +0200
+++ libxml2-2.9.0-mine//xmlwriter.c	2012-09-07 15:17:15.000000000 +0200
@@ -4610,6 +4610,26 @@
 }
 
 /**
+ * xmlTextWriterSetQuoteChar:
+ * @writer:  the xmlTextWriterPtr
+ * @quotechar:  the quote character
+ *
+ * Set the character used for quoting attributes.
+ *
+ * Returns -1 on error or 0 otherwise.
+ */
+int
+xmlTextWriterSetQuoteChar(xmlTextWriterPtr writer, xmlChar quotechar)
+{
+    if ((writer == NULL))
+        return -1;
+
+    writer->qchar = quotechar;
+
+    return 0;
+}
+
+/**
  * xmlTextWriterWriteIndent:
  * @writer:  the xmlTextWriterPtr
  *