When you add custom tag stuff to templates, e.g. like this:

Normal text<strong>bold text</strong>
<custom name='factbox'><line>box text</line>
<link href='default@mysite.com'>My Mail</link>
</custom>

you provoke lots of warnings, all stemming from the file
kernel/classes/datatypes/ezxmltext/handlers/output/ezxhtmlxmloutput.php

See php-log output on my WIN2K test box below. I think some code cleansing would be appropriate here.

______________________________________________________________
Php log examples for ezxmltext-rendering with the functions in ezxhtmlxmloutput.php:

Warning: PHP Apr 01 2003 15:22:38

Undefined offset: 0 in c:\\programme\\apachegroup\\apache\\htdocs\\leportal\\ezp\\kernel\\classes\\datatypes\\ezxmltext\\handlers\\output
ezxhtmlxmloutput.php on line 157

Warning: eZTemplate:gt Apr 01 2003 15:22:38

Unsupported type: boolean( ), must be either array, attribute object or numerical

Warning: PHP Apr 01 2003 15:22:38

Undefined variable: sectionLevel in c:\\programme\\apachegroup\\apache\\htdocs\\leportal\\ezp\\kernel\\classes\\datatypes\\ezxmltext\\handlers\\output
ezxhtmlxmloutput.php on line 360

Warning: PHP Apr 01 2003 15:22:38

Undefined variable: tdSctionLevel in c:\\programme\\apachegroup\\apache\\htdocs\\leportal\\ezp\\kernel\\classes\\datatypes\\ezxmltext\\handlers\\output
ezxhtmlxmloutput.php on line 360

Warning: PHP Apr 01 2003 15:22:38

Undefined offset: 0 in c:\\programme\\apachegroup\\apache\\htdocs\\leportal\\ezp\\kernel\\classes\\datatypes\\ezxmltext\\handlers\\output
ezxhtmlxmloutput.php on line 157

Warning: PHP Apr 01 2003 15:22:38

Undefined offset: 0 in c:\\programme\\apachegroup\\apache\\htdocs\\leportal\\ezp\\kernel\\classes\\datatypes\\ezxmltext\\handlers\\output
ezxhtmlxmloutput.php on line 157

Warning: eZTemplate:gt Apr 01 2003 15:22:38

Unsupported type: boolean( ), must be either array, attribute object or numerical

Warning: eZTemplate Apr 01 2003 15:22:38

No template could be loaded for "content/datatype/view/ezxmltags/custom.tpl" using resource "design"

Warning: PHP Apr 01 2003 15:22:38

Undefined offset: 1 in c:\\programme\\apachegroup\\apache\\htdocs\\leportal\\ezp\\kernel\\classes\\datatypes\\ezxmltext\\handlers\\output
ezxhtmlxmloutput.php on line 157

Warning: PHP Apr 01 2003 15:22:38

Undefined offset: 0 in c:\\programme\\apachegroup\\apache\\htdocs\\leportal\\ezp\\kernel\\classes\\datatypes\\ezxmltext\\handlers\\output
ezxhtmlxmloutput.php on line 157

Warning: eZTemplate:gt Apr 01 2003 15:22:38

Unsupported type: boolean( ), must be either array, attribute object or numerical