protected void init(Element restriction) {
    List conditionNodes = XMLUtil.getChildElements(restriction, "conditions");
    int length = conditionNodes.size();

    for (int i = 0; i < length; ++i) {
      Element condition = (Element) conditionNodes.get(i);
      ConditionsDescriptor conditionDescriptor =
          DescriptorFactory.getFactory().createConditionsDescriptor(condition);
      conditionDescriptor.setParent(this);
      this.conditions.add(conditionDescriptor);
    }
  }
  protected void init(Element register) {
    this.type = register.getAttribute("type");
    this.variableName = register.getAttribute("variable-name");

    try {
      setId(Integer.parseInt(register.getAttribute("id")));
    } catch (NumberFormatException e) {
    }

    List args = XMLUtil.getChildElements(register, "arg");

    for (int l = 0; l < args.size(); l++) {
      Element arg = (Element) args.get(l);
      this.args.put(arg.getAttribute("name"), XMLUtil.getText(arg));
    }
  }
  protected void init(Element root) {
    NodeList children = root.getChildNodes();

    for (int i = 0; i < children.getLength(); i++) {
      Node child = children.item(i);

      if (child.getNodeName().equals("meta")) {
        Element meta = (Element) child;
        String value = XMLUtil.getText(meta);
        this.metaAttributes.put(meta.getAttribute("name"), value);
      }
    }

    // handle registers - OPTIONAL
    Element r = XMLUtil.getChildElement(root, "registers");

    if (r != null) {
      List registers = XMLUtil.getChildElements(r, "register");

      for (int i = 0; i < registers.size(); i++) {
        Element register = (Element) registers.get(i);
        RegisterDescriptor registerDescriptor =
            DescriptorFactory.getFactory().createRegisterDescriptor(register);
        registerDescriptor.setParent(this);
        this.registers.add(registerDescriptor);
      }
    }

    // handle global-conditions - OPTIONAL
    Element globalConditionsElement = XMLUtil.getChildElement(root, "global-conditions");

    if (globalConditionsElement != null) {
      Element globalConditions = XMLUtil.getChildElement(globalConditionsElement, "conditions");

      ConditionsDescriptor conditionsDescriptor =
          DescriptorFactory.getFactory().createConditionsDescriptor(globalConditions);
      conditionsDescriptor.setParent(this);
      this.globalConditions = conditionsDescriptor;
    }

    // handle initial-steps - REQUIRED
    Element intialActionsElement = XMLUtil.getChildElement(root, "initial-actions");
    List initialActions = XMLUtil.getChildElements(intialActionsElement, "action");

    for (int i = 0; i < initialActions.size(); i++) {
      Element initialAction = (Element) initialActions.get(i);
      ActionDescriptor actionDescriptor =
          DescriptorFactory.getFactory().createActionDescriptor(initialAction);
      actionDescriptor.setParent(this);
      this.initialActions.add(actionDescriptor);
    }

    // handle global-actions - OPTIONAL
    Element globalActionsElement = XMLUtil.getChildElement(root, "global-actions");

    if (globalActionsElement != null) {
      List globalActions = XMLUtil.getChildElements(globalActionsElement, "action");

      for (int i = 0; i < globalActions.size(); i++) {
        Element globalAction = (Element) globalActions.get(i);
        ActionDescriptor actionDescriptor =
            DescriptorFactory.getFactory().createActionDescriptor(globalAction);
        actionDescriptor.setParent(this);
        this.globalActions.add(actionDescriptor);
      }
    }

    // handle common-actions - OPTIONAL
    //   - Store actions in HashMap for now. When parsing Steps, we'll resolve
    //      any common actions into local references.
    Element commonActionsElement = XMLUtil.getChildElement(root, "common-actions");

    if (commonActionsElement != null) {
      List commonActions = XMLUtil.getChildElements(commonActionsElement, "action");

      for (int i = 0; i < commonActions.size(); i++) {
        Element commonAction = (Element) commonActions.get(i);
        ActionDescriptor actionDescriptor =
            DescriptorFactory.getFactory().createActionDescriptor(commonAction);
        actionDescriptor.setParent(this);
        addCommonAction(actionDescriptor);
      }
    }

    // handle timer-functions - OPTIONAL
    Element timerFunctionsElement = XMLUtil.getChildElement(root, "trigger-functions");

    if (timerFunctionsElement != null) {
      List timerFunctions = XMLUtil.getChildElements(timerFunctionsElement, "trigger-function");

      for (int i = 0; i < timerFunctions.size(); i++) {
        Element timerFunction = (Element) timerFunctions.get(i);
        Integer id = new Integer(timerFunction.getAttribute("id"));
        FunctionDescriptor function =
            DescriptorFactory.getFactory()
                .createFunctionDescriptor(XMLUtil.getChildElement(timerFunction, "function"));
        function.setParent(this);
        this.timerFunctions.put(id, function);
      }
    }

    // handle steps - REQUIRED
    Element stepsElement = XMLUtil.getChildElement(root, "steps");
    List steps = XMLUtil.getChildElements(stepsElement, "step");

    for (int i = 0; i < steps.size(); i++) {
      Element step = (Element) steps.get(i);
      StepDescriptor stepDescriptor =
          DescriptorFactory.getFactory().createStepDescriptor(step, this);
      this.steps.add(stepDescriptor);
    }

    // handle splits - OPTIONAL
    Element splitsElement = XMLUtil.getChildElement(root, "splits");

    if (splitsElement != null) {
      List split = XMLUtil.getChildElements(splitsElement, "split");

      for (int i = 0; i < split.size(); i++) {
        Element s = (Element) split.get(i);
        SplitDescriptor splitDescriptor = DescriptorFactory.getFactory().createSplitDescriptor(s);
        splitDescriptor.setParent(this);
        this.splits.add(splitDescriptor);
      }
    }

    // handle joins - OPTIONAL:
    Element joinsElement = XMLUtil.getChildElement(root, "joins");

    if (joinsElement != null) {
      List join = XMLUtil.getChildElements(joinsElement, "join");

      for (int i = 0; i < join.size(); i++) {
        Element s = (Element) join.get(i);
        JoinDescriptor joinDescriptor = DescriptorFactory.getFactory().createJoinDescriptor(s);
        joinDescriptor.setParent(this);
        this.joins.add(joinDescriptor);
      }
    }
  }