Is it possible to "include" GTK UI XML fragment from other one?

Platform
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Essentially I want a way to

  1. Reuse UI subdivisions without creating 2 GtkBuilder instance out of the same XML file and assemble stuffs programmatically.
  2. Avoid indentation hell in a single large XML.

Is that possible for now? I’m working with GTK4 nightly.

I’m awared of certain XML standard construct that makes possible XML inclusion if processed by a conforming XML parser. Does this work for GTK with GResource?

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No, you can’t use XInclude or other XML tricks.

The proper way to reduce complexity in UI definition files is to split widgets into separate classes and use composite widget templates.

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