[xml] memory issues when using xmlXPathEvalExpression

Hi All,
I'm having two issues when using libxml and its with my code only.
But please let me know, how to get this fixed.
1. A problem with the memory issue, I guess.
    With the below piece of code, in the constructor I have already created a xpathCtx = xmlXPathNewContext(tree);
    And then, I have written a xpatheval method, which gets the path to be evaluated.
    Because I evaluate the xpath _expression_ in many places, I have written this method.
    But with this, sometimes there is a segmentation fault in the xmlXPathEvalExpression( ) call.
    (when executing 10 times, twice it gives segv). How can I debug the memory issues with the libxml api's call
    or what could be wrong here?
xmlNodeSetPtr OTAccess::OTxmlXPathEvalExpression(string path)
    const xmlChar* cpath = xmlCharStrdup(path.c_str());
    xpathObj = xmlXPathEvalExpression(cpath, xpathCtx);
    return (xpathObj->nodesetval);
2. Another problem is, I wrote a test program which sets the content of an element
    using xmlNodeSetContent(pnode, ""), which is working fine.
    But when I used it in my actual code, xmlNodeSetContent(pnode, ""), it gives the following error.
Access.cpp:100: error: invalid conversion from 'const char*' to 'const xmlChar*'
Access.cpp:100: error:   initializing argument 2 of 'void xmlNodeSetContent(xmlNode*, const xmlChar*)'
     Should I need to type cast to const xmlChar*. Even then, how it worked in the test program.
Please help me to fix these problems.

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