The text for gluon appears to have the relationships inverted: 5545 says (for the RELATED-TO property). Also has significant typos
The parameter value can be PARENT, to
indicate that the referenced calendar component is a superior of
calendar component; CHILD to indicate that the referenced calendar
component is a subordinate of the calendar component; or SIBLING
to indicate that the referenced calendar component is a peer of
the calendar component.
Table 1.4 text for gluon appears to reverse this.