Reverse cross reference
A reverse cross reference (or reverse XRef) corresponds to the link going from a target document back to the source document in a bidirectional link.
Reverse cross references can have a type and title which are different from that of the forward link. Generally the reverse type is
"None" and the reverse title refers to the source document.
Standard Format, reverse cross references can be expressed using the
<xref ... reverselink="true" reversetitle="Origin" reversetype="None" />
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