Hello, thanks Hans, this works perfectly...
Lukas
\startbuffer[demo] <a> <aa number="--">--</aa> <aa number="a1">A1</aa> <ax number="x1">X1</ab> <ab number="b1">B1</ab> <aa number="--">--</aa> <aa number="a2">A2</aa> <ax number="x2">X2</ab> <ab number="b2">B2</ab> <aa number="--">--</aa> <aa number="a3">A3</aa> <ax number="x3">X3</ab> <ab number="b3">B3</ab> </a> \stopbuffer \startxmlsetups xml:initialize \xmlsetsetup{#1}{*}{xml:*} \stopxmlsetups \startxmlsetups xml:a \xmlflush{#1} \stopxmlsetups \startxmlsetups xml:aa \par <aa>\xmlflush{#1}</aa> \par \stopxmlsetups \startxmlsetups xml:ax \par <ax>\xmlflush{#1}</ax> \par \stopxmlsetups \startxmlsetups xml:ab \par <ab> \xmlflush{#1}:\space aa: \xmlfilter{#1}{reverse-sibling::[tag() == 'aa']/attribute('number')}\space ax: \xmlfilter{#1}{reverse-sibling::[tag() == 'ax']/attribute('number')}\space </ab> \par \stopxmlsetups \xmlregistersetup{xml:initialize} \starttext \xmlprocessbuffer{main}{demo}{} \stoptext
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