Updating XML prior to XSLT transformation

Question

I am attempting to convert an XML document using XSLT but I need to transform it a bit beforehand. Does anyone have a suggestion as to how to do this?
Below is the logic that will transform the XML directly from the file, but I need to manipulate it first.
Thanks in advance.
Patti
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamSource;
import javax.xml.transform.stream.StreamResult;
import java.io.*;
public class Transform {
     * Performs an XSLT transformation, sending the results
     * to System.out.
    public static void main(String[] args) throws Exception {
        if (args.length != 2) {
            System.err.println(
                "Usage: java Transform [xmlfile] [xsltfile]");
            System.exit(1);
        File xmlFile = new File(args[0]);
        File xsltFile = new File(args[1]);
        // JAXP reads data using the Source interface
        Source xmlSource = new StreamSource(xmlFile);
        Source xsltSource = new StreamSource(xsltFile);
        // the factory pattern supports different XSLT processors
        TransformerFactory transFact =
                TransformerFactory.newInstance();
        Transformer trans = transFact.newTransformer(xsltSource);
        trans.transform(xmlSource, new StreamResult(System.out));
}

Answer 1

The first scenerio is what I intended. Since I posted my question I realized that I can manipulate the string and then create a StringSource passing a StringReader like so:
StringReader src = new StringReader(xmlStr);
StringWriter target = new StringWriter();
currentTransformer.transform(new StreamSource(src),
                             new StreamResult(target));Thanks.