what are the possible elements in liferay-hook.xml?

The following elements are possible


<!ELEMENT portal-properties (#PCDATA)>

<!ELEMENT language-properties (#PCDATA)>

<!ELEMENT custom-jsp-dir (#PCDATA)>

<!ELEMENT service (service-type, service-impl)>

<!ELEMENT service-type (#PCDATA)>

<!ELEMENT service-impl (#PCDATA)>