Fix highlighting of processing instructions.

lib/ace/mode/xquery_highlight_rules.js

@@ -48,7 +48,8 @@ var XQueryHighlightRules = function() {
             next: "cdata"
         }, {
             token: "xml-pe",
-            regex: "<\\?.*?\\?>"
+            regex: "<\\?",
+            next: "pi"
         }, {
             token: "comment",
             regex: "<\\!--",
@@ -125,6 +126,16 @@ var XQueryHighlightRules = function() {
             regex: "'.*?'"
         }],
         
+        pi: [{
+          token: "xml-pe",
+          regex: ".*\\?>",
+          next: "start"
+        },
+        {
+          token: "xml-pe",
+          regex: ".*"
+        }],
+
         cdata: [{
             token: "support.type",
             regex: "\\]\\]>",