<relcell>The <relcell> element defines a cell in the relationship table
(<reltable>). The <topicref> elements that it
contains are related to the <topicref> elements in other cells of the
same row. By default, topics or resources that are referenced in the same cell are not
related to each other, unless you change the @collection-type attribute of the
<relcell> to indicate that they are related.
Category: Basic map elements