I created a very simple svg file:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg xmlns:svg="
http://www.w3.org/2000/svg" xmlns="
http://www.w3.org/2000/svg" id="svg2" version="1.1">
<g>
<path
style="fill:#ffc000;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
d="M 20,0 0,20 0,161.8 100,161.8 100,0 z M 20,0 L 20,20 L 0,20"
id="fileshape"
/>
</g>
</svg>
I can import it into my custom symbol library in yEd, but I can't change the fill color or stroke color/width in yEd, I'm stuck with whatever is in svg. Is there any way to change this? I understand why in general for svg shapes you treat them as-is, but for files that just have a single <path> element, why can't you recognize and modify the path style as necessary?