# DvDuration: Mixed Pattern and  Interval not supported by ADL Parser

**Category:** [Reference Implementation: Java (archive)](https://discourse.openehr.org/c/reference-implementation-java-archive/154)
**Created:** 2010-07-12 11:38 UTC
**Views:** 4
**Replies:** 1
**URL:** https://discourse.openehr.org/t/dvduration-mixed-pattern-and-interval-not-supported-by-adl-parser/13487

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## Post #1 by @system

Hi Rong and all,

The ADLParser does not appear to support a mixed pattern and Interval for a DV_DURATION.

>From the ADL Specs

> `Mixed Pattern and Interval`
> `In some cases there is a need to be able to limit the allowed units as well as state a duration interval.`
> `This is common in obstetrics, where physicians want to be able to set an interval from say 0-50 weeks`
> `and limit the units to only weeks and days. This can be done as follows:`
> `PWD/|P0W..P50W| -- 0-50 weeks, expressed only using weeks and days`
> `The general form is a pattern followed by a slash ('/') followed by an interval, as follows:`
> `duration_pattern '/' duration_interval`

I have implemented the following change in the Parser (in red).


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## Post #2 by @system

Hi Sebastian,

I can confirm the changes. I just re-arranged the code to make it clearer.

Cheers,
Rong


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**Canonical:** https://discourse.openehr.org/t/dvduration-mixed-pattern-and-interval-not-supported-by-adl-parser/13487
**Original content:** https://discourse.openehr.org/t/dvduration-mixed-pattern-and-interval-not-supported-by-adl-parser/13487