The a element indicate links (also known as Hyperlinks or Web links).
The remote resource (the destination for the link) is defined by a <URI>
specified by the XLink xlink:href attribute. The remote resource may be
any Web resource (e.g., an image, a video clip, a sound bite, a program,
another SVG document, an HTML document, an element within the current
document, an element within a different document, etc.). By activating
these links (by clicking with the mouse, through keyboard input, voice
commands, etc.), users may visit these resources.
A Hyperlink is defined for each separate rendered element
contained within the Hyperlink class; add sublements as usual with
the add method.