| A Child object is something contained by a parent,
and this class contains methods to support that. Most user code will not
use this class directly.
Node
Constructor. Any inheritors of this class should call super to make sure
this method is called. @param parent if supplied, the parent of this child
will be set to the supplied value, and self will be added to the parent
Removes this child from the parent. @return self
@return the document this child belongs to, or nil if this child belongs to
no document
This doesn't yet handle encodings
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