One of the following elements can be used to attach an access control policy to the resource. This is a violation of the axiom that the SP doesn't do access control, but it's really just a call-out that has some predefined plugins you can use as examples to create more.

• <htaccess>
  • Enables Apache .htaccess support during the authorization phase. This is automatic and implicit for the "Native" request mapper, but can be enabled by hand if the "XML" request mapper is used. Note that this will fail for non-Apache servers.

• <AccessControlProvider>
  • Attaches a custom access control policy supported by a plugin.

• <AccessControl>
  • Attaches an access control policy using the sample XML-based plugin provided with the SP. This is just a short-hand for embedding the policy in the element above, if you want the policy inside the same file.

If no element is included (or inherited or implicitly enabled), any access control is left to the resource.

If an error occurs when processing this element, a dummy policy to deny access is installed to prevent accidental exposure.