[Dev] Small tweak to parcel loader

[John Anderson]

Suppose I have two attributes:

    <Attribute itemName="parentBlock">
      <type itemref="docSchema:Block"/>
      <cardinality>single</cardinality>
      <inverseAttribute itemref="docSchema:Block/childrenBlocks"/>
      <defaultValue itemref="None"/>
    </Attribute>
 
    <Attribute itemName="childrenBlocks">
      <type itemref="docSchema:Block"/>
      <cardinality>list</cardinality>
      <inverseAttribute itemref="docSchema:Block/parentBlock"/>
      <initialValue/>
    </Attribute>

I would assume that block.parent block would never throw an 
AttributeNotFound exception. However, in my code it does. Is this a bug 
or is the data model too complicated for me to understand?

John

Morgen Sagen wrote:

> By popular demand:  if you want to set the defaultValue or 
> initialValue of a list or dict attribute to be an empty list or dict, 
> you may now include either "<defaultValue/>" or "<initialValue/>" 
> inside that attribute's definition.  For example:
>
>   <Attribute itemName="listAttr">
>     <displayName>List Attribute</displayName>
>     <cardinality>list</cardinality>
>     <type itemref="String"/>
>     <initialValue/>
>   </Attribute>
>
> ~morgen
>
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