XML Schema Validator

Location:	http://temp.andreas-waechter.de/notinvalid.html
Redirect:
Well-formed:	False
Valid:	False
HTTP status code:	200 OK
HTTP Content Type:	text/html
HTTP encoding:
XML encoding:	utf-8
Used encoding:	utf-8
Public Identifier:	-//W3C//DTD XHTML 1.0 Strict//EN
System Identifier:	http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd
Validated as:	XHTML 1.0 Strict

There is no schema that is identified by 'auto'.
Your document lacks a namespace declaration such as '<html xmlns="http://www.w3.org/1999/xhtml">' on the document element.
Only well-formedness constraints will be checked, while validity constraints will be ignored.

'<' is an invalid attribute character. (5:61)

<img src="bla.png" width="dreizehn>zentimeter" height="sonst<irgendeintext" alt="bla" />
                                                            ^

If you think the validation result is incorrect or if you have difficulties to understand the messages, feel free to write me an e-mail.