Deriving from another property value.

[rbkprod]

Is it possible to derive the value of a custom property from another custom property(ies)?
I imagine the XML would look something like this;

##Custom property 1:
~~~~~~~~~~~~~~~~~~
<property name="custom:domain">
          <title>Domain</title>
          <type>d:text</type>
          <mandatory>false</mandatory>
 </property>
##Custom property 2:
~~~~~~~~~~~~~~~~~~
<property name="custom:rights">
          <title>Rights</title>
          <type>d:text</type>
          <mandatory>false</mandatory>
 </property>

##Derive newFileName from domain and rights:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<property name="custom:newFileName">
         <title>New File Name</title>
         <type>d:text</type>
         <mandatory>false</mandatory>
         <value>custom:domain custom:rights</value> <—- Here
</property>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Something like that. I know that doesn't work. Just to show what I want to do. Anyone have an idea how the XML for this would look?

Thanks.

[rbkprod]

Solved with a js file.

[arliejacobs]

This provides a review of the theoretical basis and the assumptions required in order to use hedonic price equations derived from property value data to obtain measures of the prices and the inverse demand functions for environmental amenities such as air quality. The goals of the XML Schema language are discussed in the XML Schema Requirements document.The datatype language, which is itself represented in XML 1.0, provides a superset of the capabilities found in XML 1.0 document type definitions (DTDs) for specifying datatypes on elements and attributes.