diff --git a/unoxml/source/dom/documentbuilder.cxx b/unoxml/source/dom/documentbuilder.cxx
index 2e8146f09c41..ec85c525bcd1 100644
--- a/unoxml/source/dom/documentbuilder.cxx
+++ b/unoxml/source/dom/documentbuilder.cxx
@@ -34,6 +34,7 @@
 #include <libxml/xmlerror.h>
 #include <libxml/tree.h>
 
+#include <boost/shared_ptr.hpp>
 
 #include <rtl/alloc.h>
 #include <rtl/memory.h>
@@ -62,21 +63,6 @@ using ::com::sun::star::task::XInteractionHandler;
 
 namespace DOM
 {
-    extern "C" {
-        //char *strdup(const char *s);
-        /*
-        static char* strdupfunc(const char* s)
-        {
-            sal_Int32 len = 0;
-            while (s[len] != '\0') len++;
-            char *newStr = (char*)rtl_allocateMemory(len+1);
-            if (newStr != NULL)
-                rtl_copyMemory(newStr, s, len+1);
-            return newStr;
-        }
-        */
-    }
-
 
     class CDefaultEntityResolver : public cppu::WeakImplHelper1< XEntityResolver >
     {
@@ -118,7 +104,6 @@ namespace DOM
 
     Reference< XInterface > CDocumentBuilder::_getInstance(const Reference< XMultiServiceFactory >& rSMgr)
     {
-        // XXX
         return static_cast< XDocumentBuilder* >(new CDocumentBuilder(rSMgr));
     }
 
@@ -324,7 +309,6 @@ namespace DOM
 
     void throwEx(xmlParserCtxtPtr ctxt) {
         OUString msg = make_error_message(ctxt);
-        xmlFreeParserCtxt(ctxt);
         com::sun::star::xml::sax::SAXParseException saxex;
         saxex.Message = msg;
         saxex.LineNumber = static_cast<sal_Int32>(ctxt->lastError.line);
@@ -343,14 +327,15 @@ namespace DOM
         xmlCharEncoding enc = xmlParseCharEncoding(encstr);
         */
 
-        xmlParserCtxtPtr ctxt = xmlNewParserCtxt();
+        ::boost::shared_ptr<xmlParserCtxt> const pContext(
+                xmlNewParserCtxt(), xmlFreeParserCtxt);
 
         // register error functions to prevent errors being printed
         // on the console
-        ctxt->_private = this;
-        ctxt->sax->error = error_func;
-        ctxt->sax->warning = warning_func;
-        ctxt->sax->resolveEntity = resolve_func;
+        pContext->_private = this;
+        pContext->sax->error = error_func;
+        pContext->sax->warning = warning_func;
+        pContext->sax->resolveEntity = resolve_func;
 
         // IO context struct
         context_t c;
@@ -359,13 +344,12 @@ namespace DOM
         // we did not open the stream, thus we do not close it.
         c.close = false;
         c.freeOnClose = false;
-        xmlDocPtr pDoc = xmlCtxtReadIO(ctxt, xmlIO_read_func, xmlIO_close_func, &c,
-                     0, 0, 0);
+        xmlDocPtr const pDoc = xmlCtxtReadIO(pContext.get(),
+                xmlIO_read_func, xmlIO_close_func, &c, 0, 0, 0);
 
         if (pDoc == 0) {
-            throwEx(ctxt);
+            throwEx(pContext.get());
         }
-        xmlFreeParserCtxt(ctxt);
         Reference< XDocument > const xRet(
                 CDocument::CreateCDocument(pDoc).get());
         return xRet;
@@ -385,15 +369,17 @@ namespace DOM
         }
 
         // set up parser context
-        xmlParserCtxtPtr ctxt = xmlNewParserCtxt();
+        ::boost::shared_ptr<xmlParserCtxt> const pContext(
+                xmlNewParserCtxt(), xmlFreeParserCtxt);
+
         // register error functions to prevent errors being printed
         // on the console
-        ctxt->_private = this;
-        ctxt->sax->error = error_func;
-        ctxt->sax->warning = warning_func;
+        pContext->_private = this;
+        pContext->sax->error = error_func;
+        pContext->sax->warning = warning_func;
 
         // setup entity resolver binding(s)
-        ctxt->sax->resolveEntity = resolve_func;
+        pContext->sax->resolveEntity = resolve_func;
         xmlSetExternalEntityLoader(external_entity_loader);
 
         // if an input stream is provided, use it
@@ -408,19 +394,19 @@ namespace DOM
     {
         ::osl::MutexGuard const g(m_Mutex);
 
-        xmlParserCtxtPtr ctxt = xmlNewParserCtxt();
-        ctxt->_private = this;
-        ctxt->sax->error = error_func;
-        ctxt->sax->warning = warning_func;
-        ctxt->sax->resolveEntity = resolve_func;
+        ::boost::shared_ptr<xmlParserCtxt> const pContext(
+                xmlNewParserCtxt(), xmlFreeParserCtxt);
+        pContext->_private = this;
+        pContext->sax->error = error_func;
+        pContext->sax->warning = warning_func;
+        pContext->sax->resolveEntity = resolve_func;
         // xmlSetExternalEntityLoader(external_entity_loader);
         OString oUri = OUStringToOString(sUri, RTL_TEXTENCODING_UTF8);
         char *uri = (char*) oUri.getStr();
-        xmlDocPtr pDoc = xmlCtxtReadFile(ctxt, uri, 0, 0);
+        xmlDocPtr pDoc = xmlCtxtReadFile(pContext.get(), uri, 0, 0);
         if (pDoc == 0) {
-            throwEx(ctxt);
+            throwEx(pContext.get());
         }
-        xmlFreeParserCtxt(ctxt);
         Reference< XDocument > const xRet(
                 CDocument::CreateCDocument(pDoc).get());
         return xRet;