Merge pull request #846 from michaelhkay/master

845 Drop mention of tuples

specifications/xquery-40/src/expressions.xml

@@ -18688,26 +18688,24 @@ subexpressions of the quantified expression that appear after the variable bindi
 matching</termref>, a <termref
                def="dt-type-error">type error</termref> is raised <errorref class="TY" code="0004"
             />.</p>
-         <p>The order in which test expressions are evaluated for the various binding
-tuples is <termref
+
+         <p diff="chg" at="issue845">The order in which test expressions are evaluated 
+            for the various items in the binding sequence is <termref
                def="dt-implementation-dependent"
                >implementation-dependent</termref>. If the quantifier
-is <code>some</code>, an implementation may
-return <code>true</code> as soon as it finds one binding tuple for which the test expression has
-an <termref
-               def="dt-ebv"
-               >effective boolean value</termref> of <code>true</code>, and it may raise a <termref
-               def="dt-dynamic-error"
-               >dynamic error</termref> as soon as it finds one binding tuple for
-which the test expression raises an error. Similarly, if the quantifier is <code>every</code>, an implementation may return <code>false</code> as soon as it finds one binding tuple for which the test expression has
-an <termref
-               def="dt-ebv"
+               is <code>some</code>, an implementation may
+               return <code>true</code> as soon as it finds one item for which the test expression has
+               an <termref def="dt-ebv">effective boolean value</termref> of <code>true</code>, and it may raise a <termref
+               def="dt-dynamic-error">dynamic error</termref> as soon as it finds one item for
+            which the test expression raises an error. Similarly, if the quantifier is <code>every</code>, an 
+            implementation may return <code>false</code> as soon as it finds one item for which the test expression has
+            an <termref def="dt-ebv"
                >effective boolean value</termref> of <code>false</code>, and it may raise a <termref
-               def="dt-dynamic-error"
-            >dynamic error</termref> as soon as it finds one binding tuple for
-which the test expression raises an error. As a result of these rules, the
-value of a quantified expression is not deterministic in the presence of
-errors, as illustrated in the examples below.</p>
+               def="dt-dynamic-error">dynamic error</termref> as soon as it finds one item for
+            which the test expression raises an error. As a result of these rules, the
+            value of a quantified expression is not deterministic in the presence of
+            errors, as illustrated in the examples below.</p>
+         
          <p>Here are some examples of quantified expressions:</p>
 
          <ulist>
@@ -18749,7 +18747,7 @@ one <code>employee</code> element satisfies the given comparison expression:</p>
 
             <item>
                <p>In the following examples, each quantified expression evaluates its test
-expression over nine pairs of variable bindings, formed from the Cartesian
+expression over nine pairs of items, formed from the Cartesian
 product of the sequences <code>(1, 2, 3)</code> and <code>(2, 3, 4)</code>. 
                   The expression beginning with <code>some</code> evaluates to <code>true</code>, 
                   and the expression beginning with <code>every</code> evaluates to <code>false</code>.</p>
@@ -18763,7 +18761,7 @@ satisfies $x + $y = 4]]></eg>
             <item>
                <p>This quantified expression may either return  <code>true</code> or raise a <termref
                      def="dt-type-error"
-                     >type error</termref>, since its test expression returns <code>true</code> for one variable binding
+                     >type error</termref>, since its test expression returns <code>true</code> for one item
 and raises a <termref
                      def="dt-type-error">type error</termref> for another:</p>
                <eg role="parse-test"><![CDATA[some $x in (1, 2, "cat") satisfies $x * 2 = 4]]></eg>
@@ -18775,10 +18773,16 @@ and raises a <termref
             <item>
                <p>This quantified expression may either return <code>false</code> or raise a <termref
                      def="dt-type-error"
-                     >type error</termref>, since its test expression returns <code>false</code> for one variable binding and raises a <termref
+                     >type error</termref>, since its test expression returns <code>false</code> for one item and raises a <termref
                      def="dt-type-error">type error</termref> for another:</p>
                <eg role="parse-test"><![CDATA[every $x in (1, 2, "cat") satisfies $x * 2 = 4]]></eg>
             </item>
+
+            <item>
+               <p>This quantified expression returns <code>true</code>, because the binding sequence
+                  is empty, despite the fact that the condition can never be satisfied:</p>
+               <eg role="parse-test"><![CDATA[every $x in () satisfies ($x lt 0 and $x gt 0)]]></eg>
+            </item>