sphinxcontrib-svg-links in short svg-links let you link from SVG elements anywhere, even to Sphinx labels.

Install the package

$ pip install sphinxcontrib-svg-links

Add the extension to your conf.py

extensions = [
        ...,
        
        'sphinxcontrib_svg_links.extension',
        
        ...,
        ]

In this SVG file fragment

        <a xlink:href="svglink://#other-reference-label">
            <ellipse cx="235" cy="220" rx="40" ry="40" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)"
                     pointer-events="all"/>
        </a>

the ellipse element links to svglink://#ellipse-reference-label which is a pseudo URI. Such links can be comfortably set utilizing draw.io or any other capable SVG editor.

The pseudo URI svglink://#ellipse-reference-label is a reference to a Spinx label defined elsewhere:

.. _ellipse-reference-label:

The queen of elements - the ellipse
-----------------------------------

svg-links introduces a new attribute svglinks to the image, and figure directive.

.. image:: ../diagram.svg
  :svglinks: True
  :width: 400
  :alt: Beautiful diagram

.. figure:: ../diagram.svg
  :svglinks: True
  :width: 400
  :alt: Beautiful diagram
    
  What a nice diagram!
    

If the svglinks attribute exists and is True, then the SVG will be not treated as an image but will be embedded as an HTML . So you can decide which SVG image will have links and which may not.

svg-links will the parse the SVG file and replace the pseudo URIs with relative links to the sphinx labels in the document.

ToDo