portlet*                   0+
 description               0+
 portlet-name*             1
 display-name              0+
 portlet-class*            1
 init-param                0+
   description             0+
   name                    1
   value                   1
 expiration-cache          0-1
 supports*                 1+
   mime-type*              1
   portlet-mode            0+
 supported-locale          0+
 |-1-|- resource-bundle*   1
 |   |- portlet-info       0-1
 |   |      title          1
 |   |      short-title    0-1
 |   |      keywords       0-1
 |-2-|- portlet-info*      1
 |   |      title*         1
 |   |      short-title    0-1
 |   |      keywords       0-1
 portlet-preferences       0-1
   preference              0+
     name                  1
     value                 0+
     read-only             0-1
   preferences-validator   0-1
 security-role-ref         0+
   description             0+
   role-name               1
   role-link               0-1
custom-portlet-mode        0+
 description               0+
 portlet-mode              1
custom-window-state        0+
 description               0+
 window-state              1
user-attribute             0+
 description               0+
 name                      1
security-constraint        0+
 display-name              0+
 portlet-collection        1
   portlet-name            1+
 user-data-constraint      1
   description             0+
   transport-guarantee     1