Some errors are caught and reported with line number, some without. this validation error " The attribute ' blahblah' is Notepad+ + go to Plugins > Plugin manager > Show Plugin Manager then find Xml Tools plugin. Open XML document you want to validate and click Ctrl + Shift + Alt + M ( Or use Menu if this is your preference Plugins >. ELEMENT autohaus ( auto | # PCDATA) > is not legal in a DTD. If you want to declare mixed content, allowing character data optionally interspersed with other elements ( in any order), you must put the # PCDATA keyword first.