# New CR to handle non-inclusive two-sided ranges

**Category:** [Implementers (archive)](https://discourse.openehr.org/c/implementers-archive/158)
**Created:** 2007-03-03 23:12 UTC
**Views:** 1
**Replies:** 1
**URL:** https://discourse.openehr.org/t/new-cr-to-handle-non-inclusive-two-sided-ranges/12696

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## Post #1 by @thomas.beale

In the NHS work, Sam has discovered the need to support non\-inclusive
two\-sided ranges in ADL, e\.g\. 0 > x <= 1000

This means some relatively easy additions to the dADL parse rules \(you
need to include the dADL primitive type patterns in the cADL production
rule set as well\)\.
I have created a CR for this \- see
http://coruscant.chime.ucl.ac.uk:8200/openEHR_Collector/projects/specifications/CR/242.
I will put up the changed ADL document in a day or so, as well as a test
archetype\. I have a vague feeling that someone else brought this up as
well, but I can't find the post\. If someone remembers, I will credit
them as a co\-raiser\.

\- thomas beale

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## Post #2 by @Paul1

> I have a vague feeling that someone else brought this up as
> well, but I can't find the post\. If someone remembers, I will credit
> them as a co\-raiser\.

Hi, Tom\.

Chris Date raised this issue in "Temporal Data and the Relational Model" in
2003, the range being a time interval\.  Maybe you remember it from there?

Is he a member?

\- Paul

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**Canonical:** https://discourse.openehr.org/t/new-cr-to-handle-non-inclusive-two-sided-ranges/12696
**Original content:** https://discourse.openehr.org/t/new-cr-to-handle-non-inclusive-two-sided-ranges/12696