This works:
local metadata = xml.filter (t, '../../topics/topic[@t:id=="' .. ch_id
.. '"]')
also this:
local lpath = string.format('../../topics/topic[@t:id=="%s"]', ch_id)
local metadata = xml.filter (t, lpath)
It looks like xml.filter supports only 2 arguments (see lxml-tex.lua),
and so it doesn't let you use string formatting patterns like the
"context" command does.
You can write:
context('the value of @t:id is "%s"', ch_id)
but you can't write:
xml.filter (t, '../../topics/topic[@t:id=="%s"]', ch_id)
Best wishes,
Massi
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