Rev 499029 calcops field required?

[Chris Howe]

In Rev. 499029 the simple-methods.xsd was changed to make field-name a
required attribute of <calcops/>.  Was this done on purpose?  
There are quite a few uses that only use the following definition style
<calcop operator="add">
  <calcop field-name="myField1" operator="get"/>
  <calcop field-name="myField2" operator="get"/>
</calcop>