Hi all,

I’m working with Inkscape to create .svg files used in an OpenHAB-based UI.
For compatibility with OpenHAB, text elements must include a <tspan> and custom attributes like openhab="true".

Here’s the issue I’m encountering:

1. I create a simple SVG with a <rect> and a <text> element (which automatically includes a <tspan>).

2. Using the XML editor in Inkscape, I:

   • Change the id of the <rect> and the <tspan>.

   • Add a custom attribute openhab="true" inside the <tspan>.

3. I save the file.

However, when I reopen the SVG or check the file with an external text editor:

• The id change on the <rect> is correctly saved.

• But the <tspan> element:

  • Still has the original id assigned by Inkscape.

  • Does not include the openhab="true" attribute I added.

It looks like Inkscape discards manual changes to <tspan> elements upon saving.
This behavior breaks our workflow with OpenHAB.

Is this a known issue? Is there a workaround to force Inkscape to retain manual edits inside <tspan>?

Thanks in advance for any suggestions or explanations.

The SVG validator flags that use of attribute as invalid.

https://validator.w3.org/check

My test file is attached.