code: @Override
  	public List<ParsingError> doValidate() {
  
  		List<ParsingError> result = new ArrayList<> ();
  		if( this.targetStatus == null )
  			result.add( error( ErrorCode.CMD_INVALID_INSTANCE_STATUS, value( this.targetStatusAsString )));
  		else if( ! this.targetStatus.isStable())
  			result.add( error( ErrorCode.CMD_INSTABLE_INSTANCE_STATUS ));
  
  		if( ! this.context.instanceExists( this.instancePath ))
  			result.add( error( ErrorCode.CMD_NO_MATCHING_INSTANCE ));
  
  		return result;
  	}
docs: /*
  (non-Javadoc)
  @see net.roboconf.core.commands.AbstractCommandInstruction#doValidate()