<type>String</type>
          <description></description>
        </field>
        <field xml.tagName="role-hint">
          <name>roleHint</name>
          <version>1.0.0+</version>
          <type>String</type>
          <description></description>
        </field>
        <field xml.tagName="field-name">
          <name>fieldName</name>
          <required>true</required>
          <version>1.0.0+</version>

          <defaultValue>default</defaultValue>
          <required>true</required>
          <description>Item identifier.</description>
        </field>
      </fields>
    </class>
    <class rootElement="true" xml.tagName="settings">
      <name>Settings</name>
      <version>1.0.0+</version>
      <superClass>TrackableBase</superClass>
      <description>
        Root element of the user configuration file.
      </description>

func validateCustomTags(tags map[string]*meshconfig.Tracing_CustomTag) error {
	for tagName, tagVal := range tags {
		if tagVal == nil {
			return fmt.Errorf("encountered nil value for custom tag: %s", tagName)
		}
	}
	return nil
}

// ValidateFQDN checks a fully-qualified domain name
func ValidateFQDN(fqdn string) error {