no descriptions in xqdoc fn/var JSON

[apb2006]

  {
      "isDocumented" : true, 
      "arity" : 1, 
      "name" : "acos", 
      "qname" : "math:acos", 
      "signature" : "($arg as xs:double?) as xs:double? external", 
      "description" : " <div xmlns:xqdoc=\"http://www.xqdoc.org/1.0\"><p xmlns:e=\"http://www.w3.org/1999/XSL/Spec/ElementSyntax\">Returns the arc cosine of the argument, the result being in the range zero to\n                +<var>π</var> radians.</p><p xmlns:e=\"http://www.w3.org/1999/XSL/Spec/ElementSyntax\"><example role=\"signature\"><proto name=\"acos\" return-type=\"xs:double?\" isOp=\"no\" prefix=\"math\" returnEmptyOk=\"no\" returnSeq=\"no\" returnVaries=\"no\" isSchema=\"no\" isDatatype=\"no\" isSpecial=\"no\"><arg name=\"arg\" type=\"xs:double?\"/></proto></example></p><p xmlns:e=\"http://www.w3.org/1999/XSL/Spec/ElementSyntax\">This function is <termref def=\"dt-deterministic\">deterministic</termref>, <termref def=\"dt-context-independent\">context-independent</termref>,  and <termref def=\"dt-focus-independent\">focus-independent</termref>. </p><p xmlns:e=\"http://www.w3.org/1999/XSL/Spec/ElementSyntax\">If <code>$arg</code> is the empty sequence, the function returns the empty sequence.</p><p xmlns:e=\"http://www.w3.org/1999/XSL/Spec/ElementSyntax\" diff=\"chg\" at=\"G\">Otherwise the result is the arc cosine of <code>$</code><var>θ</var>,\n             treated as an angle in radians, as defined in the <bibref ref=\"ieee754-2008\"/>\n             specification of the <code>acos</code> function applied to 64-bit binary floating point\n             values.</p><p xmlns:e=\"http://www.w3.org/1999/XSL/Spec/ElementSyntax\">The treatment of the <code>invalidOperation</code> exception is defined in <specref ref=\"op.numeric\"/>. </p><p xmlns:e=\"http://www.w3.org/1999/XSL/Spec/ElementSyntax\">If <code>$arg</code> is <code>NaN</code>, or if its absolute value is greater than one,\n             then the result is <code>NaN</code>.</p><p xmlns:e=\"http://www.w3.org/1999/XSL/Spec/ElementSyntax\">In other cases the result is an <code>xs:double</code> value representing an angle\n                <var>θ</var> in radians in the range <code>0 &lt;= $</code><var>θ</var><code> &lt;=\n                +</code><var>π</var>. </p></div>\n", 
      "summary" : "<p>  Returns the arc cosine of the argument, the result being in the range zero to\n                + π  radians.</p>", 
      "annotation_str" : "", 
      "annotations" : [  ], 
      "updating" : false, 
      "parameters" : [ {
        "name" : "arg", 
        "type" : "xs:double", 
        "occurrence" : "?", 
        "description" : ""
      } ], 
      "returns" : {
        "type" : "xs:double?", 
        "description" : ""
      }, 
      "errors" : [  ]
    },