TOC & index of linking tests.
1.) linking-a-04-t: Verify basic links out of SVG content ('a').
2.) linking-uri-03-t: Verify handling of xlink attributes on 'a'.
3.) linking-a-02-b: Verify links into SVG content and fragment syntax.
4.) linking-uri-01-b: Verify 'view' element handling.
5.) linking-uri-02-b: Verify 'view' element handling (companion to linking-uri-01-f).
[Note. This is not a linking test, but a supplemental file and link
target for other linking tests.]