ACL: What is the diffrent beween DynamicRole and RoleGroups?

Hi,

What is the different between a DynamicRole and RoleGroups in Windchill 11.0? Where can I find a documentation about the different group types?

Both are used in the Context Template xml (see snipped below). The ACLs are created with the UI.

...  
<AccessControlRule>
    <domainName>/Default</domainName>
    <externalTypeId>WCTYPE|wt.doc.WTDocument|priv.Domain.MyDocument</externalTypeId>
    <lifecycleState>RELEASED</lifecycleState>
    <WTPrincipalReference isInternal="true">
      <groupName>DOCUMENT_MANAGEMENT</groupName>
      <groupType>DynamicRole</groupType>
    </WTPrincipalReference>
    <grantPermissionSet><AccessPermissionSet>
        <permissionField name="READ"></permissionField>
        <permissionField name="REVISE"></permissionField>
        <permissionField name="CHANGE_PERMISSIONS"></permissionField>
        <permissionField name="DOWNLOAD"></permissionField>
        <permissionField name="SET_STATE"></permissionField>
      </AccessPermissionSet></grantPermissionSet>
  </AccessControlRule>
  <AccessControlRule>
    <domainName>/Default</domainName>
    <externalTypeId>WCTYPE|wt.doc.WTDocument|priv.Domain.MyDocument</externalTypeId>
    <lifecycleState>RELEASED</lifecycleState>
    <WTPrincipalReference isInternal="true">
      <groupName>DOCUMENT_MANAGEMENT</groupName>
      <groupType>roleGroups</groupType>
    </WTPrincipalReference>
    <grantPermissionSet><AccessPermissionSet>
        <permissionField name="READ"></permissionField>
        <permissionField name="CREATE"></permissionField>
        <permissionField name="DOWNLOAD"></permissionField>
        <permissionField name="SET_STATE"></permissionField>
      </AccessPermissionSet></grantPermissionSet>
  </AccessControlRule>
...

Thank you,

Tom