@Override
    public String getType(final int index) {
        if (index >= 0 && index < length) {
            return data[index * 5 + 3];
        } else {
            return null;
        }
    }
Return an attribute's type by index.

@param index The attribute's index (zero-based).
@return The attribute's type, "CDATA" if the type is unknown, or null if
the index is out of bounds.
@see org.xml.sax.Attributes#getType(int)
stroom-pipeline/src/main/java/stroom/pipeline/xml/event/simple/AttributesImpl.java