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The main problem is that DocBook SGML allows indexterm elements just about everywhere, but DocBook XML is stricter. For example, this common pattern <varlistentry> <indexterm>...</indexterm> <term>...</term> ... </varlistentry> needs to be changed to something like <varlistentry> <term>...<indexterm>...</indexterm></term> ... </varlistentry> See also bb4eefe7bf518e42c73797ea37b033a5d8a8e70a. There is currently nothing in the build system that enforces that things stay valid, because that requires additional tools and will receive separate consideration.