External module in the base Suite that declares elements that are links (internal or external) by definition, such as URLs (element <uri>) and cross-references (element <xref>)
<!ENTITY % link.ent PUBLIC "-//NLM//DTD JATS (Z39.96) Archiving and Interchange DTD Suite Link Class Elements v0.4 20110131//EN" "JATS-link0.ent" >
JATS-modules0.ent