ch --&gt;
&lt;!ENTITY le       CDATA "&amp;#8804;" -- less-than or equal to, U+2264 ISOtech --&gt;
&lt;!ENTITY ge       CDATA "&amp;#8805;" -- greater-than or equal to,
                                     U+2265 ISOtech --&gt;
&lt;!ENTITY sub      CDATA "&amp;#8834;" -- subset of, U+2282 ISOtech --&gt;
&lt;!ENTITY sup      CDATA "&amp;#8835;" -- superset of, U+2283 ISOtech --&gt;
&lt;!-- note that nsup, 'not a superset of, U+2283' is not covered by the Symbol 
     font encoding and is not included. Should