diff --git a/backup/util/structure/base_nested_element.class.php b/backup/util/structure/base_nested_element.class.php
index 1cd23b032b7..b48defc8235 100644
--- a/backup/util/structure/base_nested_element.class.php
+++ b/backup/util/structure/base_nested_element.class.php
@@ -94,6 +94,10 @@ abstract class base_nested_element extends base_final_element {
     }
 
     protected function check_and_set_used($element) {
+        // First of all, check the element being added doesn't conflict with own final elements
+        if (array_key_exists($element->get_name(), $this->final_elements)) {
+            throw new base_element_struct_exception('baseelementchildnameconflict', $element->get_name());
+        }
         $grandparent = $this->get_grandoptigroupelement_or_grandparent();
         if ($existing = array_intersect($grandparent->get_used(), $element->get_used())) { // Check the element isn't being used already
             throw new base_element_struct_exception('baseelementexisting', implode($existing));
diff --git a/backup/util/structure/simpletest/testbasenestedelement.php b/backup/util/structure/simpletest/testbasenestedelement.php
index 0f5ed645eed..206fab00e9c 100644
--- a/backup/util/structure/simpletest/testbasenestedelement.php
+++ b/backup/util/structure/simpletest/testbasenestedelement.php
@@ -393,5 +393,16 @@ class base_nested_element_test extends UnitTestCase {
             $this->assertTrue($e instanceof base_element_parent_exception);
         }
 
+        // Add child element already used by own final elements
+        $nested = new mock_base_nested_element('PARENT1', null, array('FINAL1', 'FINAL2'));
+        $child = new mock_base_nested_element('FINAL2', null, array('FINAL3', 'FINAL4'));
+        try {
+            $nested->add_child($child);
+            $this->fail("Expecting base_element_struct_exception exception, none occurred");
+        } catch (Exception $e) {
+            $this->assertTrue($e instanceof base_element_struct_exception);
+            $this->assertEqual($e->errorcode, 'baseelementchildnameconflict');
+            $this->assertEqual($e->a, 'FINAL2');
+        }
     }
 }
diff --git a/backup/util/xml/parser/processors/simplified_parser_processor.class.php b/backup/util/xml/parser/processors/simplified_parser_processor.class.php
index 9dbe9b8a0fc..e87ac9d556f 100644
--- a/backup/util/xml/parser/processors/simplified_parser_processor.class.php
+++ b/backup/util/xml/parser/processors/simplified_parser_processor.class.php
@@ -104,13 +104,18 @@ abstract class simplified_parser_processor extends progressive_parser_processor
                     $alltagswhitespace = false;
                     continue;
                 }
+
                 // If the path including the tag name matches another selected path
-                // (registered or parent) delete it, another chunk will contain that info
+                // (registered or parent) and is null or begins with linefeed, we know it's part
+                // of another chunk, delete it, another chunk will contain that info
                 if ($this->path_is_selected($path . '/' . $key) ||
                     $this->path_is_selected_parent($path . '/' . $key)) {
-                    unset($data['tags'][$key]);
-                    continue;
+                    if (!isset($value['cdata']) || substr($value['cdata'], 0, 1) === "\n") {
+                        unset($data['tags'][$key]);
+                        continue;
+                    }
                 }
+
                 // Convert to simple name => value array
                 $data['tags'][$key] = isset($value['cdata']) ? $value['cdata'] : null;
 
diff --git a/backup/util/xml/parser/progressive_parser.class.php b/backup/util/xml/parser/progressive_parser.class.php
index 11f3c9c682e..91bc85fc4b2 100644
--- a/backup/util/xml/parser/progressive_parser.class.php
+++ b/backup/util/xml/parser/progressive_parser.class.php
@@ -201,7 +201,12 @@ class progressive_parser {
         // Entering a new inner level, publish all the information available
         if ($this->level > $this->prevlevel) {
             if (!empty($this->currtag) && (!empty($this->currtag['attrs']) || !empty($this->currtag['cdata']))) {
-                $this->topush['tags'][$this->currtag['name']] = $this->currtag;
+                // We always add the last not-empty repetition. Empty ones are ignored.
+                if (isset($this->topush['tags'][$this->currtag['name']]) && trim($this->currtag['cdata']) === '') {
+                    // Do nothing, the tag already exists and the repetition is empty
+                } else {
+                    $this->topush['tags'][$this->currtag['name']] = $this->currtag;
+                }
             }
             if (!empty($this->topush['tags'])) {
                 $this->publish($this->topush);
@@ -233,7 +238,12 @@ class progressive_parser {
         // Ending rencently started tag, add value to current tag
         if ($this->level == $this->prevlevel) {
             $this->currtag['cdata'] = $this->postprocess_cdata($this->accum);
-            $this->topush['tags'][$this->currtag['name']] = $this->currtag;
+            // We always add the last not-empty repetition. Empty ones are ignored.
+            if (isset($this->topush['tags'][$this->currtag['name']]) && trim($this->currtag['cdata']) === '') {
+                // Do nothing, the tag already exists and the repetition is empty
+            } else {
+                $this->topush['tags'][$this->currtag['name']] = $this->currtag;
+            }
             $this->currtag = array();
         }
 
diff --git a/backup/util/xml/parser/simpletest/fixtures/test4.xml b/backup/util/xml/parser/simpletest/fixtures/test4.xml
index f5865c47da9..4a4fa67416c 100755
--- a/backup/util/xml/parser/simpletest/fixtures/test4.xml
+++ b/backup/util/xml/parser/simpletest/fixtures/test4.xml
@@ -106,6 +106,9 @@
       <name>4</name><!-- Only last will be processed. We don't allow repeated final tags in our parser -->
       <value>4</value>
       <value>5</value><!-- Only last will be processed. We don't allow repeated final tags in our parser -->
+      <value>
+
+      </value><!-- If one tag already is set and the repeated is empty, the original value is kept -->
     </othertest>
   </glossary>
 </activity>
diff --git a/mod/lesson/backup/moodle2/backup_lesson_stepslib.php b/mod/lesson/backup/moodle2/backup_lesson_stepslib.php
index 0b90f423dea..c55bffe0a92 100644
--- a/mod/lesson/backup/moodle2/backup_lesson_stepslib.php
+++ b/mod/lesson/backup/moodle2/backup_lesson_stepslib.php
@@ -76,8 +76,11 @@ class backup_lesson_activity_structure_step extends backup_activity_structure_st
             'minquestions','maxpages','timed','maxtime','retake','activitylink',
             'mediafile','mediaheight','mediawidth','mediaclose','slideshow',
             'width','height','bgcolor','displayleft','displayleftif','progressbar',
-            'highscores','maxhighscores','available','deadline','timemodified'
+            'showhighscores','maxhighscores','available','deadline','timemodified'
         ));
+        // Tell the lesson element about the showhighscores elements mapping to the highscores
+        // database field.
+        $lesson->set_source_alias('highscores', 'showhighscores');
 
         // The lesson_pages table
         // Grouped within a `pages` element, important to note that page is relational
diff --git a/mod/lesson/backup/moodle2/restore_lesson_stepslib.php b/mod/lesson/backup/moodle2/restore_lesson_stepslib.php
index b716355b64c..00dc383f09d 100644
--- a/mod/lesson/backup/moodle2/restore_lesson_stepslib.php
+++ b/mod/lesson/backup/moodle2/restore_lesson_stepslib.php
@@ -62,6 +62,13 @@ class restore_lesson_activity_structure_step extends restore_activity_structure_
         $data->deadline = $this->apply_date_offset($data->deadline);
         $data->timemodified = $this->apply_date_offset($data->timemodified);
 
+        // lesson->highscores can come both in data->highscores and
+        // data->showhighscores, handle both. MDL-26229
+        if (isset($data->showhighscores)) {
+            $data->highscores = $data->showhighscores;
+            unset($data->showhighscores);
+        }
+
         // insert the lesson record
         $newitemid = $DB->insert_record('lesson', $data);
         // immediately after inserting "activity" record, call this
diff --git a/mod/quiz/backup/moodle2/backup_quiz_stepslib.php b/mod/quiz/backup/moodle2/backup_quiz_stepslib.php
index 7a05c5a49c1..655cb5f8474 100644
--- a/mod/quiz/backup/moodle2/backup_quiz_stepslib.php
+++ b/mod/quiz/backup/moodle2/backup_quiz_stepslib.php
@@ -39,7 +39,7 @@ class backup_quiz_activity_structure_step extends backup_questions_activity_stru
         // Define each element separated
         $quiz = new backup_nested_element('quiz', array('id'), array(
             'name', 'intro', 'introformat', 'timeopen',
-            'timeclose', 'optionflags', 'penaltyscheme', 'attempts',
+            'timeclose', 'optionflags', 'penaltyscheme', 'attempts_number',
             'attemptonlast', 'grademethod', 'decimalpoints', 'questiondecimalpoints',
             'review', 'questionsperpage', 'shufflequestions', 'shuffleanswers',
             'questions', 'sumgrades', 'grade', 'timecreated',
@@ -119,6 +119,7 @@ class backup_quiz_activity_structure_step extends backup_questions_activity_stru
         }
 
         // Define source alias
+        $quiz->set_source_alias('attempts', 'attempts_number');
         $grade->set_source_alias('grade', 'gradeval');
         $attempt->set_source_alias('attempt', 'attemptnum');
 
diff --git a/mod/quiz/backup/moodle2/restore_quiz_stepslib.php b/mod/quiz/backup/moodle2/restore_quiz_stepslib.php
index 30f8baa0ae2..72222419322 100644
--- a/mod/quiz/backup/moodle2/restore_quiz_stepslib.php
+++ b/mod/quiz/backup/moodle2/restore_quiz_stepslib.php
@@ -67,6 +67,13 @@ class restore_quiz_activity_structure_step extends restore_questions_activity_st
 
         $data->questions = $this->questions_recode_layout($data->questions);
 
+        // quiz->attempts can come both in data->attempts and
+        // data->attempts_number, handle both. MDL-26229
+        if (isset($data->attempts_number)) {
+            $data->attempts = $data->attempts_number;
+            unset($data->attempts_number);
+        }
+
         // insert the quiz record
         $newitemid = $DB->insert_record('quiz', $data);
         // immediately after inserting "activity" record, call this