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Errors regarding MIME-Types

Basis for checking and processing briefing is the W3C-specification for XHTML Media Types.

Missing HTTP-Header 'Content-Type'

HTTP-Header:

Content-Type:

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>missing mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

If HTTP-Header "Content-Type" is missing, there is no information, how to process (SGML or XML) the document. So an Error has to be reported.

HTML-Document with the MIME-Type "text/html"

HTTP-Header:

Content-Type: text/html; charset=ISO-8859-1

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>legal mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

This document was delivered with the correct MIME-Type "text/html" and should validate without any error / warning.

HTML-Document with incorrect MIME-Type "text/css"

HTTP-Header:

Content-Type: text/css; charset=ISO-8859-1

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>illegal mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

A HTML-Document must be delivered with MIME-Type "text/xml".
Other MIME-Types are not allowed !

HTML-Document with incorrect MIME-Type "application/xhtml+xml"

HTTP-Header:

Content-Type: application/xhtml+xml; charset=ISO-8859-1

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>illegal mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

A HTML-document has to be transmitted with the MIME-Type "text/html".
All other MIME-Types are not allowed.

HTML-Document with incorrect MIME-Type "text/xml"

HTTP-Header:

Content-Type: text/xml; charset=ISO-8859-1

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>illegal mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

A HTML-Document must be delivered with MIME-Type "text/xml".
Other MIME-Types are not allowed !

HTML-Document with incorrect MIME-Type "application/xml"

HTTP-Header:

Content-Type: application/xml; charset=ISO-8859-1

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>illegal mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

A HTML-Document must be delivered with MIME-Type "text/xml".
Other MIME-Types are not allowed !

HTML-Document with incorrect MIME-Type "image/svg"

HTTP-Header:

Content-Type: image/svg; charset=ISO-8859-1

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>illegal mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

A HTML-Document must be delivered with MIME-Type "text/xml".
Other MIME-Types are not allowed !

HTML-Document with incorrect MIME-Type "image/svg+xml"

HTTP-Header:

Content-Type: image/svg+xml; charset=ISO-8859-1

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>illegal mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

A HTML-Document must be delivered with MIME-Type "text/xml".
Other MIME-Types are not allowed !

HTML-Document with incorrect MIME-Type "application/smil"

HTTP-Header:

Content-Type: application/smil; charset=ISO-8859-1

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>illegal mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

A HTML-Document must be delivered with MIME-Type "text/xml".
Other MIME-Types are not allowed !

HTML-Document with incorrect MIME-Type "text/vnd.wap.wml"

HTTP-Header:

Content-Type: text/vnd.wap.wml; charset=ISO-8859-1

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>illegal mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

A HTML-Document must be delivered with MIME-Type "text/xml".
Other MIME-Types are not allowed !

HTML-Document with incorrect MIME-Type "application/vnd.wap.xhtml+xml"

HTTP-Header:

Content-Type: application/vnd.wap.xhtml+xml; charset=ISO-8859-1

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>illegal mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

A HTML-Document must be delivered with MIME-Type "text/xml".
Other MIME-Types are not allowed !

HTML-Document with unknown MIME-Type "foo/foo"

HTTP-Header:

Content-Type: foo/foo; charset=ISO-8859-1

  1: <!DOCTYPE HTML PUBLIC 
  2:     "-//W3C//DTD HTML 4.01 Transitional//EN"
  3:     "http://www.w3.org/TR/html4/loose.dtd">
  4: 
  5: <html>
  6:   <head>
  7:     <title>illegal mime-type</title>
  8:     <meta http-equiv="content-type"
  9:           content="text/html; charset=iso-8859-1">
 10:   </head>
 11:   <body></body>
 12: </html>

A HTML-Document must be delivered with MIME-Type "text/xml".
Other MIME-Types are not allowed !

XHTML 1.0 - Document with MIME-Type "text/html"

HTTP-Header:

Content-Type: text/html; charset=ISO-8859-1

  1: <?xml version="1.0" encoding="ISO-8859-1"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  3:      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4:  
  5: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
  6:   <head>
  7:     <title>Content-Type is text/html</title>
  8:   </head>
  9:   <body />
 10: </html>

This XHTML 1.0-document will be transmitted with MIME-Type "text/html". This is allowed, only if the document corresponds to the HTML-guidelines.

XHTML 1.1 - Document with MIME-Type "text/html"

HTTP-Header:

Content-Type: text/html; charset=ISO-8859-1

  1: <?xml version="1.0" encoding="ISO-8859-1"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" 
  3:         "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
  4:  
  5: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de">
  6:   <head>
  7:     <title>Content-Type is text/html</title>
  8:   </head>
  9:   <body>
 10:     <p />
 11:   </body>
 12: </html>

This XHTML 1.1-document will be transmitted with MIME-Type "text/html".
In contrast to XHTML 1.0 that MIME-Type is undesired, but you can't avoid it in real life.

XHTML 1.0 - Document with MIME-Type "application/xhtml+xml"

HTTP-Header:

Content-Type: application/xhtml+xml; charset=ISO-8859-1

  1: <?xml version="1.0" encoding="ISO-8859-1"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  3:      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4:  
  5: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
  6:   <head>
  7:     <title>Content-Type is application/xhtml+xml</title>
  8:   </head>
  9:   <body />
 10: </html>

This XHTML 1.0-document will be transmitted with the valid MIME-Type "application/xhtml+xml".

XHTML 1.0 - Document with MIME-Type "text/xml"

HTTP-Header:

Content-Type: text/xml; charset=ISO-8859-1

  1: <?xml version="1.0" encoding="ISO-8859-1"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  3:      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4:  
  5: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
  6:   <head>
  7:     <title>Content-Type is text/xml</title>
  8:   </head>
  9:   <body />
 10: </html>

This XHTML 1.0-document will be transmitted with the valid MIME-Type "text/xml".

XHTML 1.0 - Document with MIME-Type "application/xml"

HTTP-Header:

Content-Type: application/xml; charset=ISO-8859-1

  1: <?xml version="1.0" encoding="ISO-8859-1"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  3:      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4:  
  5: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
  6:   <head>
  7:     <title>Content-Type is application/xml</title>
  8:   </head>
  9:   <body />
 10: </html>

This XHTML 1.0-document will be transmitted with the valid MIME-Type "application/xml".

XHTML 1.0 - Document with incorrect MIME-Type "image/svg"

HTTP-Header:

Content-Type: image/svg; charset=ISO-8859-1

  1: <?xml version="1.0" encoding="ISO-8859-1"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  3:      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4:  
  5: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
  6:   <head>
  7:     <title>Content-Type is image/svg</title>
  8:   </head>
  9:   <body />
 10: </html>

This is a XHTML 1.0 document, delivered with Content-Type image/svg; this is not allowed.

XHTML 1.0 - Document with incorrect MIME-Type "image/svg+xml"

HTTP-Header:

Content-Type: image/svg+xml; charset=ISO-8859-1

  1: <?xml version="1.0" encoding="ISO-8859-1"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  3:      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4:  
  5: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
  6:   <head>
  7:     <title>Content-Type is image/svg+xml</title>
  8:   </head>
  9:   <body />
 10: </html>

This XHTML 1.0 - Document was delivered with Content-Type image/svg+xml; this is not allowed.

XHTML 1.0 - Document with incorrect MIME-Type 'application/smil'

HTTP-Header:

Content-Type: application/smil; charset=ISO-8859-1

  1: <?xml version="1.0" encoding="ISO-8859-1"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  3:      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4:  
  5: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
  6:   <head>
  7:     <title>Content-Type is application/smil</title>
  8:   </head>
  9:   <body />
 10: </html>

This XHTML 1.0-document will be transmitted with MIME-Type "application/smil". That is invalid and an Error message has to be reported.

XHTML 1.0 - Document with incorrect MIME-Type "text/vnd.wap.wml"

HTTP-Header:

Content-Type: text/vnd.wap.wml; charset=ISO-8859-1

  1: <?xml version="1.0" encoding="ISO-8859-1"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  3:      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4:  
  5: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
  6:   <head>
  7:     <title>Content-Type is text/vnd.wap.wml</title>
  8:   </head>
  9:   <body />
 10: </html>

This XHTML 1.0 - Document was delivered with Content-Type text/vnd.wap.wml; this is not allowed.

XHTML 1.0 - Document with incorrect MIME-Type "application/vnd.wap.xhtml+xml"

HTTP-Header:

Content-Type: application/vnd.wap.xhtml+xml; charset=ISO-8859-1

  1: <?xml version="1.0" encoding="ISO-8859-1"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  3:      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4:  
  5: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
  6:   <head>
  7:     <title>Content-Type is application/vnd.wap.xhtml+xml</title>
  8:   </head>
  9:   <body />
 10: </html>

This XHTML 1.0 - Document was delivered with Content-Type application/vnd.wap.xhtml+xml; this is not allowed.

XML-Document with incorrect MIME-Type "text/html"

HTTP-Header:

Content-Type: text/html; charset=ISO-8859-1

  1: <!DOCTYPE root [ 
  2:   <!ELEMENT foo EMPTY> 
  3:   <!ELEMENT root (foo)> 
  4: ]> 
  5: <root> 
  6:   <foo/> 
  7: </root> 
  8:

XML-Document was delivered with MIME-Type "text/html"
For this reason the validation was processed in SGML-Mode errors are reported even though the document is valid XML.
Validome supports following XML-MIME-Types:
text/xml
image/svg
image/svg+xml
application/smil
application/xml
application/xhtml+xml
text/vnd.wap.wml
application/vnd.wap.xhtml+xml

WML-Document with MIME-Type "text/vnd.wap.wml"

HTTP-Header:

Content-Type: text/vnd.wap.wml; charset=UTF-8

  1: <?xml version="1.0" encoding="utf-8"?> 
  2: <!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.3//EN" 
  3:     "http://www.wapforum.org/DTD/wml13.dtd"> 
  4: 
  5: <wml> 
  6:   <card title="Validator"> 
  7:     <do type="prev" label="Back"> 
  8:       <prev/> 
  9:     </do> 
 10:     <p align="center"> 
 11:        Hello world! 
 12:       <br /> 
 13:     </p> 
 14:   </card> 
 15: </wml>

A WML-Document can be delivered only with MIME-Type text/vnd.wap.wml or application/vnd.wap.xhtml+xml.

"application/xhtml+xml" WML-Document with incorrect MIME-Type "application/xhtml+xml"

HTTP-Header:

Content-Type: application/xhtml+xml; charset=UTF-8

  1: <?xml version="1.0" encoding="utf-8"?> 
  2: <!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.3//EN" 
  3:     "http://www.wapforum.org/DTD/wml13.dtd"> 
  4: 
  5: <wml> 
  6:   <card title="Validator"> 
  7:     <do type="prev" label="Back"> 
  8:       <prev/> 
  9:     </do> 
 10:     <p align="center"> 
 11:        Hello world! 
 12:       <br /> 
 13:     </p> 
 14:   </card> 
 15: </wml>

Your WML-Document was delivered with MIME-Type application/xhtml+xml, which is not allowed.

WML-Document with incorrect MIME-Type "text/xml"

HTTP-Header:

Content-Type: text/xml; charset=UTF-8

  1: <?xml version="1.0" encoding="utf-8"?> 
  2: <!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.3//EN" 
  3:     "http://www.wapforum.org/DTD/wml13.dtd"> 
  4: 
  5: <wml> 
  6:   <card title="Validator"> 
  7:     <do type="prev" label="Back"> 
  8:       <prev/> 
  9:     </do> 
 10:     <p align="center"> 
 11:        Hello world! 
 12:       <br /> 
 13:     </p> 
 14:   </card> 
 15: </wml>

Your WML-Document was delivered with MIME-Type text/xml, which is not allowed.

HTML-Document with unknown Public-ID and MIME-Type "text/xml"

HTTP-Header:

Content-Type: text/xml; charset=ISO-8859-1

  1: <!DOCTYPE html PUBLIC "-//VALIDOME//DTD Validome ist Toll//EN"
  2:   "http://www.validome.org/check/dtd_5034.dtd">
  3: 
  4: <html>
  5:   <head>
  6:     <title>illegal mime-type</title>
  7:   </head>
  8:   <body></body>
  9: </html>

This HTML-Document with an unknown Public-ID has been delivered with MIME-Type text/xml.
By means of Puiblic-ID or MIME-Type we can not recognize if the delivered document is HTML, so it will be processed as XML.

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