public DocumentSet preselect(DocumentSet in_docs, StaticContext context) throws XPathException { return getArgument(0).preselect(in_docs, context);
public DocumentSet preselect(DocumentSet in_docs) throws XPathException { return getArgument(0).preselect(in_docs);
    public DocumentSet preselect(DocumentSet in_docs, StaticContext context) throws XPathException {		return getArgument(0).preselect(in_docs, context);    }