xl:simple 

The abstract element at the head of the simple link substitution group.

Element Information

Model

Attributes

QName Type Fixed Default Use Inheritable Annotation
xlink:actuate restriction of string optional
xlink:arcrole restriction of anyURI optional
xlink:href anyURI required
xlink:role restriction of anyURI optional
xlink:show restriction of string optional
xlink:title string optional
xlink:type restriction of string simple required
Wildcard: ANY attribute from namespace(s) 'http://www.w3.org/XML/1998/namespace'

Source 

<element name="simple" type="xl:simpleType" abstract="true">
  <annotation>
    <documentation>The abstract element at the head of the simple link substitution group.</documentation>
  </annotation>
</element>

Sample