code: private String getIdent(BioPAXElement bpe) {
  		String ident = "----";
  
  		if(bpe instanceof pathway) {
  			ident = "-pw-";
  		} else if(bpe instanceof interaction) {
  			ident = "-in-";
  		} else if (bpe instanceof protein) {
  			ident = "-pr-";
  		} else if (bpe instanceof complex) {
  			ident = "-co-";
  		} 
  		return ident;
  	}
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