Link elements that can be used inside addresses. This is essentially the three generic external links — <ext-link>, <email>, and <uri> — plus a new link element created for the NCBI Collection and NCBI Book Tag Sets, <multi-link>.
In earlier releases, this parameter entity was named %address-elements; although it functioned as a class.
<!ENTITY % address-link.class "email | ext-link | multi-link | uri" >
bookcustom-classes3.ent