The xlink:show attribute has four predefined values:
replace
new
embed
undefined
Can have other application dependent values as well.
Like all attributes in valid documents, the
xlink:show attribute must be declared in a
<!ATTLIST> declaration for the DTD's link
element. For example:
<!ELEMENT WEBSITE (#PCDATA)>
<!ATTLIST WEBSITE
xmlns:xlink CDATA #FIXED "http://www.w3.org/1999/xlink"
xlink:type CDATA #FIXED "simple"
xlink:href CDATA #REQUIRED
xlink:show (new | replace | embed) #IMPLIED "replace"
>