XPathWrapper core dump

[Jason Jesso]

Hi:
I am using the latest Xalan for AIX.
I run the sample program like:
xml-xalan/c/bin/XPathWrapper ./foo.xml /doc "/doc/name/text()"
the result set has 10 strings
item 1= "Mr. Marston"
item 2= "Mr. Bertoni"
item 3= "Mr. Leslie"
item 4= "Ms. Farmer"
item 5= "Ms. Midy"
item 6= "Mr. Dick"
item 7= "Mr. Boag"
item 8= "Mr. Curcuru"
item 9= "Mr. Kesselman"
item 10= "Mr. Auriemma"

With no problems.
If I try running it with an invalid XPath expression, the program core 
dumps.

Like:
xml-xalan/c/bin/XPathWrapper ./foo.xml /doc "/doc/name/txt()"
Abort(coredump)
In the C++ sample code, is there a way to check to see if the XPath 
expression is valid?  

It core dumps on:
line 243 of XPathWrapper.cpp
theXPathProcessor.initXPath(*xpath,
                                   theXPathConstructionContext,
                                   TranscodeFromLocalCodePage(expr),
                                   ElementPrefixResolverProxy(rootElem, 
theEnvSupport, theDOMSupport));

If I follow this example code,  I don't want my code to just crash like 
this.

Thanks for any help.