[x1]

http://www.iana.org/assignments/character-sets

>The MIBenum value is a unique value for use in MIBs to identify coded character sets.

>The value space for MIBenum values has been divided into three regions. The first region (3-999) consists of coded character sets that have been standardized by some standard setting organization. This region is intended for standards that do not have subset implementations. The second region (1000-1999) is for the Unicode and ISO/IEC 10646 coded character sets together with a specification of a (set of) sub-repertoires that may occur. The third region (>1999) is intended for vendor specific coded character sets.

However that specific error (reference to entity "x" for which no system identifier could be generated) has this message:

>This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.

I notice this on one website that is using MIBEnumID:

<span

  class="st_facebook_large"  

  displaytext="Facebook"     

  st_url='http://www.hardrock.com/locations/cafes3/events.aspx?locationid=108&MIBenumID  
  

Could it be that it is just throwing this error because of the unencoded ampersand? And that since it is part of some MS/ASP.net setup it is everywhere?