XPATH outOfMemory while evaluating large XML files.

[Enric Jaen]

Hello, I got an OutOfMemory when I evaluate an XPATH expression a large XML 
file.

I am using this code:

        XPathFactory factory = XPathFactory.newInstance();
        XPath xpath = factory.newXPath();
        InputSource entities_is=new InputSource("file.xml");
        XPathExpression xpathExpr = xpath.compile(expr);
        return (NodeList)xpathExpr.evaluate(entities_is, 
XPathConstants.NODESET);

I am not an expert of XPATH development, therefore I'd appreciate if someone 
could give me an explanation of why is this error happening.
Is this because XPATH uses DOM internaly? If so, is there any implementation 
for XPATH for SAX?
Is there any other explanation/solution?

Thanks in advance for your help.
-Enric