public int clampSpan(Attributes atts) throws SAXException {
        int span = AttributeUtil.parseNonNegativeInteger(
                atts.getValue("", "span"));
        if (span > MAX_COLSPAN) {
            err("The value of the \u201Cspan\u201D attribute must be less than"
                    + " or equal to " + MAX_COLSPAN + ".");
            span = MAX_COLSPAN;
        }
        return span;
    }
@see nu.validator.checker.Checker#startElement(java.lang.String,
     java.lang.String, java.lang.String, org.xml.sax.Attributes)
src/nu/validator/checker/table/TableChecker.java