Add error conditions, revise streaming rules

specifications/xslt-40/src/xslt.xml

@@ -26530,6 +26530,20 @@ the same group, and the-->
 
 
                </example>
+
+               <p diff="add" at="issue731">
+                  <error spec="XT" type="static" class="SE" code="3355">
+                     <p>It is a <termref def="dt-static-error">static error</termref> for a 
+                        an <elcode>xsl:accumulator-rule</elcode> element to specify
+                     <code>capture="yes"</code> unless it also specifies <code>phase="end"</code>.</p>
+                  </error>
+               </p>
+
+               <note diff="add" at="issue731">
+                  <p>Since <code>capture="yes"</code> causes the subtree of the relevant element node
+                  to be built in memory, using this option on an element that has a large subtree is best
+                  avoided, because it can defeat the purpose of streaming.</p>
+               </note>
 
 
 
@@ -26576,10 +26590,7 @@ the same group, and the-->
                            the <termref def="dt-expression">expression</termref> in the <code>select</code> attribute or the contained
                            <termref def="dt-sequence-constructor"/>, with respect to the declared type of the accumulator,
                            is <termref def="dt-grounded"/> and <termref def="dt-motionless"/>.</p></item>
-                        <item><p>The rule has <code>capture="yes"</code> and the <termref def="dt-sweep"/> of
-                           the <termref def="dt-expression">expression</termref> in the <code>select</code> attribute or the contained
-                           <termref def="dt-sequence-constructor"/>
-                           is <termref def="dt-consuming"/> or <termref def="dt-motionless"/>.</p></item>
+                        <item><p diff="chg" at="issue731">The rule has <code>capture="yes"</code>.</p></item>
                      </olist>
                   </item>