[NTG-context] unknown references

[Hans Hagen]

We've added a tracker:

\enabletrackers [structures.referencing.show]

\starttext

     Take a look at \at{page}[unknown:1].

     This line has a reference.\pagereference[unknown:2]

     Take a look at \at{page}[unknown:2].

\stoptext

Experimental till documented in the interface files.

Hans

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                                           Hans Hagen | PRAGMA ADE
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