For general child nodes, this will be $this->prototype.
But if $this->removeKeyAttribute is true and there are only two keys in the child node:
one is same as this->keyAttribute and the other is 'value', then the prototype will be different.
For example, assume $this->keyAttribute is 'name' and the value array is as follows:
array(
array(
'name' => 'name001',
'value' => 'value001'
)
)
Now, the key is 0 and the child node is:
array(
'name' => 'name001',
'value' => 'value001'
)
When normalizing the value array, the 'name' element will removed from the child node
and its value becomes the new key of the child node:
array(
'name001' => array('value' => 'value001')
)
Now only 'value' element is left in the child node which can be further simplified into a string:
array('name001' => 'value001')
Now, the key becomes 'name001' and the child node becomes 'value001' and
the prototype of child node 'name001' should be a ScalarNode instead of an ArrayNode instance.
