diff --git a/ChangeLog.md b/ChangeLog.md
index cc3f1472..149bd7a8 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -3,6 +3,12 @@ XML APIs for the XP Framework ChangeLog
 
 ## ?.?.? / ????-??-??
 
+## 11.0.0 / 2021-10-21
+
+* Made compatible with XP 11 - @thekid
+* Implemented xp-framework/rfc#341, dropping compatibility with XP 9
+  (@thekid)
+
 ## 10.0.0 / 2020-04-10
 
 * Implemented xp-framework/rfc#334: Drop PHP 5.6:
diff --git a/composer.json b/composer.json
index b88d8c1e..a32c3e41 100755
--- a/composer.json
+++ b/composer.json
@@ -6,12 +6,12 @@
   "description" : "XML APIs for the XP Framework",
   "keywords": ["module", "xp"],
   "require" : {
-    "xp-framework/core": "^10.0 | ^9.0 | ^8.0 | ^7.0",
-    "xp-framework/collections": "^9.0 | ^8.0 | ^7.0",
+    "xp-framework/core": "^11.0 | ^10.0",
+    "xp-framework/collections": "^10.0 | ^9.0 | ^8.0",
     "php" : ">=7.0.0"
   },
   "require-dev" : {
-    "xp-framework/unittest": "^11.0 | ^10.0 | ^9.0 | ^8.0 | ^7.0"
+    "xp-framework/unittest": "^11.0 | ^10.0"
   },
   "autoload" : {
     "files" : ["src/main/php/autoload.php"]
diff --git a/src/main/php/xml/Node.class.php b/src/main/php/xml/Node.class.php
index b3a77392..73be6da0 100755
--- a/src/main/php/xml/Node.class.php
+++ b/src/main/php/xml/Node.class.php
@@ -300,7 +300,7 @@ public function getSource($indent= INDENT_WRAPPED, $encoding= \xp::ENCODING, $in
       }
 
       // No content and no children => close tag
-      if (0 == strlen($content)) {
+      if (null === $content || 0 === strlen($content)) {
         if (!$this->children) return $xml."/>\n";
         $xml.= '>';
       } else {
diff --git a/src/main/php/xml/xslt/XSLDateCallback.class.php b/src/main/php/xml/xslt/XSLDateCallback.class.php
index 4224a951..a08f27c2 100755
--- a/src/main/php/xml/xslt/XSLDateCallback.class.php
+++ b/src/main/php/xml/xslt/XSLDateCallback.class.php
@@ -2,6 +2,7 @@
 
 use lang\{Enum, XPClass};
 use util\{Date, DateMath, TimeInterval, TimeZone};
+use xml\Xslmethod;
 
 /**
  * XSL callbacks for Date operations
@@ -22,7 +23,7 @@ class XSLDateCallback {
    * @param   string timezone default NULL
    * @return  string
    */
-  #[@xslmethod]
+  #[Xslmethod]
   public function format($date, $format, $timezone= null) {
     $timezone= empty($timezone) ? null : $timezone;
     return (new Date($date))->toString($format, new TimeZone($timezone));
@@ -36,7 +37,7 @@ public function format($date, $format, $timezone= null) {
    * @param   string strdate2
    * @return  int
    */
-  #[@xslmethod]
+  #[Xslmethod]
   public function diff($type, $strdate1, $strdate2) {
     return DateMath::diff(
       Enum::valueOf(XPClass::forName('util.TimeInterval'), strtoupper($type)),
diff --git a/src/main/php/xml/xslt/XSLStringCallback.class.php b/src/main/php/xml/xslt/XSLStringCallback.class.php
index 294d9e0c..d8a06b8e 100755
--- a/src/main/php/xml/xslt/XSLStringCallback.class.php
+++ b/src/main/php/xml/xslt/XSLStringCallback.class.php
@@ -1,5 +1,7 @@
 <?php namespace xml\xslt;
 
+use xml\Xslmethod;
+
 /**
  * XSL callbacks for string operations
  *
@@ -14,7 +16,7 @@ class XSLStringCallback {
    * @param   string string
    * @return  string
    */
-  #[@xslmethod]
+  #[Xslmethod]
   public function urlencode($string) {
     return urlencode($string);
   }
@@ -25,7 +27,7 @@ public function urlencode($string) {
    * @param   string string
    * @return  string
    */
-  #[@xslmethod]
+  #[Xslmethod]
   public function urldecode($string) {
     return urldecode($string);
   }
@@ -36,7 +38,7 @@ public function urldecode($string) {
    * @param   string string
    * @return  string
    */
-  #[@xslmethod]
+  #[Xslmethod]
   public function strtolower($string) {
     return strtolower($string);
   }    
@@ -47,7 +49,7 @@ public function strtolower($string) {
    * @param   string string
    * @return  string
    */
-  #[@xslmethod]
+  #[Xslmethod]
   public function strtoupper($string) {
     return strtoupper($string);
   }
@@ -60,7 +62,7 @@ public function strtoupper($string) {
    * @param   string replace
    * @return  string
    */
-  #[@xslmethod]
+  #[Xslmethod]
   public function replace($str, $search, $replace) {
     return str_replace($search, $replace, $str);
   }
@@ -71,7 +73,7 @@ public function replace($str, $search, $replace) {
    * @param   string string
    * @return  string
    */
-  #[@xslmethod]
+  #[Xslmethod]
   public function nl2br($string) {
     return nl2br($string);
   }
@@ -85,7 +87,7 @@ public function nl2br($string) {
    * @param   bool cut Do word wrapping within words (defaults to TRUE)
    * @return  string
    */
-  #[@xslmethod]
+  #[Xslmethod]
   public function wordwrap($string, $width, $break= "\n", $cut= true) {
     return wordwrap($string, $width, $break, $cut);
   }
diff --git a/src/test/php/xml/unittest/DomXslProcessorTest.class.php b/src/test/php/xml/unittest/DomXslProcessorTest.class.php
index 0f9f7bf7..37568d16 100755
--- a/src/test/php/xml/unittest/DomXslProcessorTest.class.php
+++ b/src/test/php/xml/unittest/DomXslProcessorTest.class.php
@@ -4,7 +4,6 @@
 use lang\{ElementNotFoundException, IllegalArgumentException};
 use unittest\{Expect, Test, Xslmethod};
 use xml\{DomXSLProcessor, TransformerException};
-new import('lang.ResourceProvider');
  
 /**
  * ProcessorTest implementation that tests the DomXSL processor
@@ -257,14 +256,4 @@ public function processDocuments() {
     $this->processor->run();
     $this->assertEquals('document', $this->processor->output());
   }
-  
-  #[Test]
-  public function loadXSLFromStreamWrapper() {
-    $this->processor->setXSLFile('res://xml/unittest/include.xsl');
-  }
-  
-  #[Test, Expect(FileNotFoundException::class)]
-  public function loadNonexistantXSLFromStreamWrapper() {
-    $this->processor->setXSLFile('res://nonexistant.xsl');
-  }
 }
\ No newline at end of file
diff --git a/src/test/php/xml/unittest/XslCallbackTest.class.php b/src/test/php/xml/unittest/XslCallbackTest.class.php
index 9a117dda..1bf33e75 100755
--- a/src/test/php/xml/unittest/XslCallbackTest.class.php
+++ b/src/test/php/xml/unittest/XslCallbackTest.class.php
@@ -164,7 +164,7 @@ public function dateFormatCallbackWithTZ() {
     $this->assertEquals($date->toString('Y-m-d H:i:s T', $tz), $this->runTransformation(
       Node::fromObject($date, 'date')->getSource(),
       'xp.date::format',
-      ['string(/date/value)', "'Y-m-d H:i:s T'", "'".$tz->getName()."'"]
+      ['string(/date/value)', "'Y-m-d H:i:s T'", "'".$tz->name()."'"]
     ));
   }
 
diff --git a/src/test/php/xml/unittest/io/XmlStreamWriterTest.class.php b/src/test/php/xml/unittest/io/XmlStreamWriterTest.class.php
index a25fa36b..13c952c8 100755
--- a/src/test/php/xml/unittest/io/XmlStreamWriterTest.class.php
+++ b/src/test/php/xml/unittest/io/XmlStreamWriterTest.class.php
@@ -20,7 +20,7 @@ public function startIso88591Document() {
     $this->writer->startDocument('1.0', 'iso-8859-1');
     $this->assertEquals(
       '<?xml version="1.0" encoding="iso-8859-1"?>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -29,7 +29,7 @@ public function startUtf8Document() {
     $this->writer->startDocument('1.0', 'utf-8');
     $this->assertEquals(
       '<?xml version="1.0" encoding="utf-8"?>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -38,7 +38,7 @@ public function standaloneDocument() {
     $this->writer->startDocument('1.0', 'iso-8859-1', true);
     $this->assertEquals(
       '<?xml version="1.0" encoding="iso-8859-1" standalone="yes"?>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -47,7 +47,7 @@ public function startElement() {
     $this->writer->startElement('book');
     $this->assertEquals(
       '<book>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -56,7 +56,7 @@ public function startElementWithAttribute() {
     $this->writer->startElement('book', ['isbn' => '978-3-86680-192-9']);
     $this->assertEquals(
       '<book isbn="978-3-86680-192-9">', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -65,7 +65,7 @@ public function startElementWithAttributes() {
     $this->writer->startElement('book', ['isbn' => '978-3-86680-192-9', 'authors' => 'Timm & Alex']);
     $this->assertEquals(
       '<book isbn="978-3-86680-192-9" authors="Timm &amp; Alex">', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -75,7 +75,7 @@ public function closeElement() {
     $this->writer->closeElement();
     $this->assertEquals(
       '<book></book>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -87,7 +87,7 @@ public function closeElements() {
     $this->writer->closeElement();
     $this->assertEquals(
       '<book><author></author></book>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -96,7 +96,7 @@ public function startComment() {
     $this->writer->startComment();
     $this->assertEquals(
       '<!--', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -106,7 +106,7 @@ public function closeComment() {
     $this->writer->closeComment();
     $this->assertEquals(
       '<!---->', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -115,7 +115,7 @@ public function startCData() {
     $this->writer->startCData();
     $this->assertEquals(
       '<![CDATA[', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -125,7 +125,7 @@ public function closeCData() {
     $this->writer->closeCData();
     $this->assertEquals(
       '<![CDATA[]]>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -134,7 +134,7 @@ public function startPI() {
     $this->writer->startPI('php');
     $this->assertEquals(
       '<?php ', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -144,7 +144,7 @@ public function closePI() {
     $this->writer->closePI();
     $this->assertEquals(
       '<?php ?>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -155,7 +155,7 @@ public function writeText() {
     $this->writer->closeElement();
     $this->assertEquals(
       '<book>Hello &amp; World</book>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -166,7 +166,7 @@ public function writeCData() {
     $this->writer->closeElement();
     $this->assertEquals(
       '<book><![CDATA[Hello & World]]></book>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -177,7 +177,7 @@ public function writeComment() {
     $this->writer->closeElement();
     $this->assertEquals(
       '<book><!--Hello & World--></book>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -190,7 +190,7 @@ public function writeCommentedNode() {
     $this->writer->closeElement();
     $this->assertEquals(
       '<book><!--<author>Timm</author>--></book>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -203,7 +203,7 @@ public function writeMarkup() {
     $this->writer->closeElement();
     $this->assertEquals(
       '<markup>This is <b>really</b> important!</markup>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -214,7 +214,7 @@ public function writePI() {
     $this->writer->closeElement();
     $this->assertEquals(
       '<code><?php echo "Hello World";?></code>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -223,7 +223,7 @@ public function writePIWithAttributes() {
     $this->writer->writePI('xml-stylesheet', ['href' => 'template.xsl']);
     $this->assertEquals(
       '<?xml-stylesheet href="template.xsl"?>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -236,7 +236,7 @@ public function writeCDataAndText() {
     $this->writer->closeElement();
     $this->assertEquals(
       '<book>Hello<![CDATA[ & ]]>World</book>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -245,7 +245,7 @@ public function writElement() {
     $this->writer->writeElement('book', 'Hello & World', ['isbn' => '978-3-86680-192-9']);
     $this->assertEquals(
       '<book isbn="978-3-86680-192-9">Hello &amp; World</book>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -254,7 +254,7 @@ public function writElementEmptyContent() {
     $this->writer->writeElement('book');
     $this->assertEquals(
       '<book/>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -267,7 +267,7 @@ public function endDocumentClosesAllElements() {
     $this->writer->closeDocument();
     $this->assertEquals(
       '<books><book><author></author></book></books>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }
 
@@ -280,7 +280,7 @@ public function endDocumentClosesComments() {
     $this->writer->closeDocument();
     $this->assertEquals(
       '<books><!--Nothing here yet--></books>', 
-      $this->out->getBytes()
+      $this->out->bytes()
     );
   }