$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

How to Install Inkscape on Gnu/Linux Distros

GNU/Linux Installing Inkscape Guide

Hi! The Linked Tutorials Show you Step-by-Step How to Install and Getting-Started with the Latest Inkscape in GNU/Linux Desktops.

And Inkscape for Linux is an Open-Source Vector Graphics Editor similar to Adobe Illustrator, Corel Draw, Freehand, or Xara X.
What sets Inkscape apart is its use of Scalable Vector Graphics (SVG), an open XML-based W3C standard, as the native format.

Inkscape Quick Start for Linux - Featured

GNU/Linux Inkscape Vector Graphics Editor Installation Guide