Re: Empty string for DV_TEXT

[Thomas Beale <thomas.beale@oceaninformatics.com>]

On 29/06/2010 16:13, Leonardo Moretti wrote:

Thank you Ian, you are right, null_flavour tag is not needed. 
But in the previous post I proposed also an other change: in the original
ADL code
ELEMENT[at0033] occurrences matches {0..1} matches {    -- Comment
       value matches {
               DV_TEXT matches {*}
       }
}
value doesn't have the existence attribute specified. 
Being the default for existence attribute {1..1}, a DV_TEXT value tag is
  

this is a problem in ADL 1.4 that will disappear in ADL 1.5

- thomas beale

required! But when we have an empty Comment, we cannot have a DV_TEXT value
tag, so we can neither have the whole ELEMENT structure, and so we cannot
specificy a null_flavour!

To be able to do this, this extension would be needed:
ELEMENT[at0033] occurrences matches {0..1} matches {    -- Comment
       value existence matches {0..1} matches {
               DV_TEXT matches {*}
       }
}

regards
leo


Ian McNicoll-3 wrote:
  

Hi Leo,

No it works the other way round. All of the null flavours are
automatically
available unless you specifically constrain them out.

Ian

Dr Ian McNicoll
office / fax  +44(0)141 560 4657
mobile +44 (0)775 209 7859
skype ianmcnicoll
ian.mcnicoll@oceaninformatics.com
ian@mcmi.co.uk

Clinical Analyst  Ocean Informatics openEHR Archetype Editorial Group
Member BCS Primary Health Care SG Group www.phcsg.org / BCS Health
Scotland


    

--

Thomas Beale Chief Technology Officer, Ocean Informatics Chair Architectural Review Board, openEHR Foundation Honorary Research Fellow, University College London Chartered IT Professional Fellow, BCS, British Computer Society Health IT blog

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