[CForms] xreporter assertion validation problem

[Joerg Heinicke]

It's a problem of "optionally required" as mentioned not only once on 
the list. As a temporary solution I wanted to adapt Vadim's work around 
[1] using assertion validation. Therefore I had a look into the 
XReporter expression language [2] and wrote following form defintion.

<wd:field id="persontype">
  <wd:datatype base="integer"/>
</wd:field>
<!-- NaturalPerson -->
<wd:field id="lastname">
  <wd:label><i18n:text key="lastname"/></wd:label>
  <wd:datatype base="string">
    <wd:validation>
      <wd:assert test="If(persontype = 0, Not(IsNull(lastname)), true)"/>
    </wd:validation>
  </wd:datatype>
</wd:field>
<wd:field id="firstname">
  <wd:label><i18n:text key="firstname"/></wd:label>
  <wd:datatype base="string">
    <wd:validation>
      <wd:assert test="If(persontype = 0, Not(IsNull(firstname)), true)"/>
    </wd:validation>
  </wd:datatype>
</wd:field>
<!-- LegalPerson -->
<wd:field id="name">
  <wd:label><i18n:text key="name"/></wd:label>
  <wd:datatype base="string">
    <wd:validation>
      <wd:assert test="If(persontype = 1, Not(IsNull(name)), true)"/>
    </wd:validation>
  </wd:datatype>
</wd:field>
<wd:field id="commercialRegisterNumber">
  <wd:label><i18n:text key="commercialRegisterNumber"/></wd:label>
  <wd:datatype base="string">
    <wd:validation>
      <wd:assert test="If(persontype = 1, 
Not(IsNull(commercialRegisterNumber)), true)"/>
    </wd:validation>
  </wd:datatype>
</wd:field>

The validation should be clear IMO:
If persontype 0 is selected the lastname and the firstname must not be 
null, otherwise return true.
If persontype 1 is selected the name and the commercialRegisterNumber 
must not be null, otherwise return true.

This works if I sent a form with persontype = 1 and both the fields name 
and commercialRegisterNumber not null. But if does not work if I switch 
to persontype 0 with the fields lastname and firstname null. There the 
validation for the fields name and commercialRegisterNumber fail though 
they are not null! Seems to be somewhat strang IMO.

Does anybody see an obvious mistake or know why?

Joerg

[1] http://marc.theaimsgroup.com/?l=xml-cocoon-dev&m=107352171910636&w=4
[2] http://xreporter.cocoondev.org/en/expressions.html