I had a chance to have a little closer look. Do something like this.
Note theat the %when !check syntax isn't documented yet. It's been
around for a few years and works (I use it at work), I'm just not
totally happy with the implementation.
action check {len--}
buffer =
(any when check)*
%when !check
@{ printf("[%d]:%d\n", len, *p); };
close =
'</XRNDATA>'
@{ printf("end XRNDATA\n"); };
expr = open len buffer close;
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