Linking elements can contain two more optional attributes that suggest to applications how the remote resource is associated with the current page. These are:
xlink:show suggests how the content should be displayed when the link is activated
xlink:actuate suggests whether the link should be traversed automatically or whether a specific user request is required
These are application dependent, however, and applications are free to ignore the suggestions.
In an xlink:simple element the prefix is dropped so these are just show and actuate respectively.