m_className = getRequiredAttr(TAG, attr, ATTR_CLASS_NAME);
- scratch = getRequiredAttr(TAG, attr, ATTR_START);
+ scratch = getOptionalAttr(attr, ATTR_START, "-1");
m_start = Integer.parseInt(scratch);
- scratch = getRequiredAttr(TAG, attr, ATTR_END);
+ scratch = getOptionalAttr(attr, ATTR_END, "-1");
m_end = Integer.parseInt(scratch);
}