Oracle Error Message
OCI-31196: XML nodes over string in size cannot be printed
Reason for the Error
An attempt was made to use an XML Text Node with a size greater than 64K, or an XML Comment Node with a size greater than 4K. These cannot be printed. For example, trying to add children to an attribute node, or passing in a document node as a child, are unsupported operations.
Solution
Use getClobVal() or getStringVal() to print the Document.