Line 122, column 108: cannot generate system identifier for general entity "alias" 
  ...sid=5d939bd82ff861c1b44295e598aa51a4&alias=bielefeld">
                                          ^
Line 122, column 108: general entity "alias" not defined and no default entity (explain...). 
  ...sid=5d939bd82ff861c1b44295e598aa51a4&alias=bielefeld">
                                          ^
Line 122, column 113: reference to entity "alias" for which no system identifier could be generated 
  ...d939bd82ff861c1b44295e598aa51a4&alias=bielefeld">
                                          ^
Line 122, column 107: entity was defined here 
  ...?sid=5d939bd82ff861c1b44295e598aa51a4&alias=bielefeld">
                                          ^