- Allows operators greather-than, less-than, ... equals and
- sets relation attribute accordingly (relation ordered).
+ Allows ranges and the operators greather-than, less-than, ...
+ equals.
+ This sets Bib-1 relation attribute accordingly (relation
+ ordered). A query construct is only treated as a range if
+ dash is used and that is surrounded by white-space. So
+ <literal>-1980</literal> is treated as term
+ <literal>"-1980"</literal> not <literal><= 1980</literal>.
+ If <literal>- 1980</literal> is used, however, that is
+ treated as a range.
+ </entry>
+ </row>
+
+ <row><entry><literal>r=r</literal></entry><entry>
+ Similar to <literal>r=o</literal> but assumes that terms
+ are non-negative (not prefixed with <literal>-</literal>).
+ Thus, a dash will always be treated as a range.
+ The construct <literal>1980-1990</literal> is
+ treated as a range with <literal>r=r</literal> but as a
+ single term <literal>"1980-1990"</literal> with
+ <literal>r=o</literal>. The special attribute
+ <literal>r=r</literal> is available in YAZ 2.0.24 or later.