SVG and encode64 element

Hello All,

I would like to upraised a request for SVG element included containing image data encoded in base64.

When I use the standard Markdown image inclusion instruction : ``,
`` elements where `xlink:href:` is a base64 data, images are not rendered in the PDF.

I tried to render the base64 date using `` and that works. This is the nested which seem does not works.

Please find in attachment a ZIP file containing :
* SVG File
* Markdown File using SVG Element and the rendered PDF
* Markdown File using `img` tage with base64 data and the rendered PDF

Do you think it's possible to render the full SVG Document or Not ?

[S4D430_EN_Col11_files.zip](https://github.com/alanshaw/markdown-pdf/files/3402766/S4D430_EN_Col11_files.zip)