code: public void setVersion(int version) throws ParserException {
  		if (this.versionSeen) throw new ParserException("Current BioEntry already has a version");
  		else {
  			try {
  				this.version = version;
  				this.versionSeen = true;
  			} catch (NumberFormatException e) {
  				throw new ParserException("Could not parse version as an integer");
  			}
  		}
  	}
docs: {@inheritDoc}