The word below is commonly used on DOCs, but I didn't find it as a link. Wouldn't it be better to write what you are linking to, instead of the word below ?
(See <link linkend="nullvalues-operands">Null-Valued Operands</link> for more explanation.)
instead of
(See <link linkend="nullvalues-operands">below</link> for more explanation.)
This is just an extension of the multi-element testing behavior described <link linkend="nullvalues-multielement">Testing Multi-Element Values with Null-Valued Elements </link>.
instead of
This is just an extension of the multi-element testing behavior described <link linkend="nullvalues-multielement">below</link>.
