PHP Soap strange handling of complex type

Question

Hi all,

I'm running a php5 based web service which contains the following complex type among others:

<xsd:complexType name="FrequencyList">
<xsd:sequence>
    <xsd:element name="F" type="xsd:float" minOccurs="0" maxOccurs="unbounded" />
</xsd:sequence>
</xsd:complexType>

Note: F reads Frequencies, I've just chopped it for readability.

Obviously the there are two aspects of this. It containts data i.e. > 0 occurances or it simply does not contain data at all.

Now, if i return this type with data in it everything works well:

<FrequencyDistribution>
      <Frequencies>0.28571428571429</Frequencies>
      <Frequencies>0.71428571428571</Frequencies>
</FrequencyDistribution>

Stange one comes up when there are no distributions:

<FrequencyDistribution href="#ref1"/>

Is there a way to tell PHP / WSDL to simply return?

<FrequencyDistribution />

I'm askink this because my soapUI tests as well as my java based client application can't use the actual return value properly.

Any ideas would be highly appreciated!

thanks

   K