Changes between Version 1 and Version 2 of Doc/panc/dml/literals


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Timestamp:
Mar 3, 2007, 6:00:08 PM (19 years ago)
Author:
/O=GRID-FR/C=FR/O=CNRS/OU=LAL/CN=Charles Loomis
Comment:

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  • Doc/panc/dml/literals

    v1 v2  
    1 = Literals =
     1''''''= Literals =
    22[[TracNav]]
    33
    … …  
    8383
    8484== Other Literals ==
     85
     86=== undef ===
     87
     88The '''undef''' literal can be used to represent the undefined element, i.e. an element which is neither a
     89property nor a resource.
     90
     91The undefined element cannot be written to a final machine profile and most built-in functions will report a fatal
     92error when processing it. It can be used to mark an element that must be overwritten during the
     93processing.
     94
     95=== null ===
     96
     97The null value deletes the path or global variable to which it is assigned.  Most operations and functions will
     98report an error if this value is processed directly.