private static void add(char c, String s, boolean attOnly) {
byte[] image = UTF8XmlOutput.toBytes(s);
attributeEntities[c] = image;
if (!attOnly) entities[c] = image;
}
/** Writes the encoded bytes to the given output stream. */
public final void write(UTF8XmlOutput out) throws IOException {
out.write(buf, 0, len);
}