this class represents an entity definition from a dtd file (and 
  possibly associated comments)
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          | isnull(self) returns whether this dtdunit doesn't actually have an entity 
      definition
 | source code |  | 
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          | parse(self,
        dtdsrc) read the first dtd element from the source code into this object, 
      return linesprocessed
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          | getoutput(self) convert the dtd entity back to string form
 | source code |  | 
  
    | Inherited from base.TranslationUnit:__eq__,getcontext,getid,getunits,hasplural,isblank,isfuzzy,isheader,isreview,istranslatable,istranslated,markfuzzy,markreviewneeded,merge,unit_iter Inherited from object:__delattr__,__getattribute__,__hash__,__new__,__reduce__,__reduce_ex__,__repr__,__setattr__ | 
  
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          | setsource(self,
        source) Sets the definition to the quoted value of source
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          | getsource(self) gets the unquoted source string
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          | gettarget(self) gets the unquoted target string
 | source code |  | 
  
    | Inherited from base.TranslationUnit:gettargetlen | 
  
  
    | Inherited from base.TranslationUnit:addnote,getnotes,removenotes | 
  
  
    | Inherited from base.TranslationUnit:addlocation,addlocations,getlocations | 
  
  
    | Inherited from base.TranslationUnit:adderror,geterrors |