The DOCTYPE statement must be present in the descriptor file in order for the portlet to run. However, the document type definition (DTD) does not need to be accessible at the URL that the statement specifies.

If you want to look at the portlet.dtd file, you can find it in the portal installation directory in the path portal/WEB-INF. For example, on a Windows system, the DTD is located at the following path: SAS-installation-directory/SASInformationDeliveryPortal/4.2/Static/wars/sas.portal/WEB-INF/classes/portlet.dtd.

<!DOCTYPE portlets SYSTEM "http://www.sas.com/idp/portlet.dtd"> 
<portlets>