Inkscape sometimes makes SVG files with forbidden elements in them that epub readers might reject, Google epubchecker does not like inkscape:connector commands and fails with:
Error: Unable to sanitize epub
If you run it locally, it will fail with this error:
ERROR: *.svg(147,2722): attribute "inkscape:connector-curvature" not allowed here; expected attribute "class", "clip-path", "clip-rule", "color", "color-interpolation", "color-rendering", "cursor", "display", "externalResourcesRequired", "fill", "fill-opacity", "fill-rule", "filter", "image-rendering", "marker-end", "marker-mid", "marker-start", "mask", "onactivate", "onclick", "onfocusin", "onfocusout", "onload", "onmousedown", "onmousemove", "onmouseout", "onmouseover", "onmouseup", "opacity", "pathLength", "pointer-events", "requiredExtensions", "requiredFeatures", "shape-rendering", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "text-rendering", "transform", "visibility", "xml:base", "xml:lang" or "xml:space"
To get around this, download and compile SVG Cleaner.
https://github.com/RazrFalcon/SVGCleaner
https://launchpad.net/~svg-cleaner-team/+archive/ubuntu/svgcleaner
You will also need z7a (7za-full on Ubuntu)
https://www.ibm.com/developerworks/community/blogs/6e6f6d1b-95c3-46df-8a26-b7efd8ee4b57/entry/how_to_use_7zip_on_linux_command_line144?lang=en
Error: Unable to sanitize epub
If you run it locally, it will fail with this error:
ERROR: *.svg(147,2722): attribute "inkscape:connector-curvature" not allowed here; expected attribute "class", "clip-path", "clip-rule", "color", "color-interpolation", "color-rendering", "cursor", "display", "externalResourcesRequired", "fill", "fill-opacity", "fill-rule", "filter", "image-rendering", "marker-end", "marker-mid", "marker-start", "mask", "onactivate", "onclick", "onfocusin", "onfocusout", "onload", "onmousedown", "onmousemove", "onmouseout", "onmouseover", "onmouseup", "opacity", "pathLength", "pointer-events", "requiredExtensions", "requiredFeatures", "shape-rendering", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "text-rendering", "transform", "visibility", "xml:base", "xml:lang" or "xml:space"
To get around this, download and compile SVG Cleaner.
https://github.com/RazrFalcon/SVGCleaner
https://launchpad.net/~svg-cleaner-team/+archive/ubuntu/svgcleaner
You will also need z7a (7za-full on Ubuntu)
https://www.ibm.com/developerworks/community/blogs/6e6f6d1b-95c3-46df-8a26-b7efd8ee4b57/entry/how_to_use_7zip_on_linux_command_line144?lang=en
