eZ debug 
Module start 'package' 
  Debug: xml string from data_text field 
    <?xml version="1.0" encoding="utf-8"?>
    <related-objects><relation-list/></related-objects>
   
  Debug: old xml doc 
    <?xml version="1.0" encoding="utf-8"?>
    <related-objects><relation-list/></related-objects>
   
  Debug: xml string from data_text field
    <?xml version="1.0" encoding="utf-8"?>
    <related-objects><relation-list/></related-objects>
   
  Debug: old xml doc
    <?xml version="1.0" encoding="utf-8"?>
    <related-objects><relation-list/></related-objects>
   
  Debug: xml string from data_text field
    <?xml version="1.0" encoding="utf-8"?>
    <related-objects><relation-list/></related-objects>
   
  Debug: old xml doc
    <?xml version="1.0" encoding="utf-8"?>
    <related-objects><relation-list/></related-objects>
   
> Debug: xml string from data_text field
  Warning: PHP: E_WARNING
    DOMDocument::loadXML() [<a href='domdocument.loadxml'>domdocument.loadxml</a>]: Empty string supplied as input in /var/www/ezpublish-4.1.1/kernel/classes/datatypes/ezobjectrelationlist/ezobjectrelationlisttype.php on line 1644 

  Error: PHP: E_RECOVERABLE_ERROR
    Argument 1 passed to DOMDocument::importNode() must be an instance of DOMNode, boolean given, called in /var/www/ezpublish-4.1.1/kernel/classes/ezcontentobject.php on line 5321 and defined in /var/www/ezpublish-4.1.1/kernel/classes/ezcontentobjectversion.php on line 1464 

  Warning: PHP: E_WARNING
    DOMDocument::importNode() expects parameter 1 to be DOMNode, boolean given in /var/www/ezpublish-4.1.1/kernel/classes/ezcontentobjectversion.php on line 1464 

  Error: PHP: E_RECOVERABLE_ERROR
    Argument 1 passed to DOMNode::appendChild() must be an instance of DOMNode, null given, called in /var/www/ezpublish-4.1.1/kernel/classes/ezcontentobject.php on line 5321 and defined in /var/www/ezpublish-4.1.1/kernel/classes/ezcontentobjectversion.php on line 1465 

  Warning: PHP: E_WARNING
    DOMNode::appendChild() expects parameter 1 to be DOMNode, null given in /var/www/ezpublish-4.1.1/kernel/classes/ezcontentobjectversion.php on line 1465 
End