static final int MAX_EXTRAS = 4;

    @CheckForNull Object element;
    List<Object> extras;

    ToOptionalState() {
      element = null;
      extras = emptyList();
    }

    IllegalArgumentException multiples(boolean overflow) {
      StringBuilder sb =
          new StringBuilder().append("expected one element but was: <").append(element);
      for (Object o : extras) {
        sb.append(", ").append(o);

	Days    int      `xml:"Days,omitempty"`
}

// Empty returns if a DelMarkerExpiration XML element is empty.
// Used to detect if lifecycle.Rule contained a DelMarkerExpiration element.
func (de DelMarkerExpiration) Empty() bool {
	return de.Days == 0
}

// UnmarshalXML decodes a single XML element into a DelMarkerExpiration value
func (de *DelMarkerExpiration) UnmarshalXML(dec *xml.Decoder, start xml.StartElement) error {

Each [architecture module and platform](platforms.md) can contribute code to any of the elements.
Not every module contributes to every element.

	trace := make([]string, traceLength)

	// Add a sequence number and formatting for each stack trace
	// No formatting is required for the first entry
	for i, element := range entry.Trace.Source {
		trace[i] = fmt.Sprintf("%8v: %s", traceLength-i, element)
	}

	tagString := ""
	for key, value := range entry.Trace.Variables {
		if value != "" {
			if tagString != "" {
				tagString += ", "
			}

    position: absolute;
    top: 15px;
    left: 15px;
    display: inline-block;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    /* A little hack to display the window buttons in one pseudo element. */
    background: #d9515d;
    -webkit-box-shadow: 25px 0 0 #f4c025, 50px 0 0 #3ec930;
            box-shadow: 25px 0 0 #f4c025, 50px 0 0 #3ec930;
}

[data-termynal]:after {
    content: 'bash';

			if buf.Len() > 0 {
				buf.WriteString("&")
			}
			buf.WriteString(t.String())
		}
		return buf.String()
	}
	return ""
}

// Validate - validates the rule element
func (r Rule) Validate() error {
	if err := r.validateID(); err != nil {
		return err
	}
	if err := r.validateStatus(); err != nil {
		return err
	}
	if err := r.validateExpiration(); err != nil {