XML Schema Validator

Location:	http://web.oesterchat.com/2012/09/08/web-echtzeitkommunikation-notwendig/
Redirect:
Well-formed:	True
Valid:	False
HTTP status code:	200 OK
HTTP Content Type:	text/html; charset=UTF-8
HTTP encoding:	utf-8
XML encoding:	utf-8
Used encoding:	utf-8
Public Identifier:	-//W3C//DTD XHTML 1.1//EN
System Identifier:	http://www.w3.org/TR/xhtml1/DTD/xhtml11.dtd
Validated as:	XHTML 1.1

You should specify the same value for the 'lang' and 'xml:lang' attributes. (2:2)
```
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de">
 ^
```
The 'cols' attribute is invalid. The value '100%' is invalid according to its datatype 'http://www.w3.org/1999/xhtml/datatypes/:Number'. The string '100%' is not a valid Integer value. (83:42)
```
<p><textarea name="comment" id="comment" cols="100%" rows="10" tabindex="4"></textarea></p>
                                         ^
```

The 'data-prefix' attribute is not declared. (88:199)

<p style="display: none;"><input type="hidden" id="akismet_comment_nonce" name="akismet_comment_nonce" value="f9aa953abe" /></p><p style="display: none !important;" class="akismet-fields-container" data-prefix="ak_"><label>&#916;<textarea name="ak_hp_textarea" cols="45" rows="8" maxlength="100"></textarea></label><input type="hidden" id="ak_js_1" name="ak_js" value="206"/><script>document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() );</script></p>
                                                                                                                                                                                                      ^

The 'maxlength' attribute is not declared. (88:281)

<p style="display: none;"><input type="hidden" id="akismet_comment_nonce" name="akismet_comment_nonce" value="f9aa953abe" /></p><p style="display: none !important;" class="akismet-fields-container" data-prefix="ak_"><label>&#916;<textarea name="ak_hp_textarea" cols="45" rows="8" maxlength="100"></textarea></label><input type="hidden" id="ak_js_1" name="ak_js" value="206"/><script>document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() );</script></p>
                                                                                                                                                                                                                                                                                        ^

The required attribute 'type' is missing. (88:377)

<p style="display: none;"><input type="hidden" id="akismet_comment_nonce" name="akismet_comment_nonce" value="f9aa953abe" /></p><p style="display: none !important;" class="akismet-fields-container" data-prefix="ak_"><label>&#916;<textarea name="ak_hp_textarea" cols="45" rows="8" maxlength="100"></textarea></label><input type="hidden" id="ak_js_1" name="ak_js" value="206"/><script>document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() );</script></p>
                                                                                                                                                                                                                                                                                                                                                                                        ^

The 'aria-current' attribute is not declared. (135:90)

 <li><a href='http://web.oesterchat.com/2012/09/08/web-echtzeitkommunikation-notwendig/' aria-current="page">Web-Echtzeitkommunikation notwendig</a></li>
                                                                                         ^

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.