Assume the use of XML Data like [XML Data] referenced in a separate window. When a data element is present in XML Data, there are three possibilities for b element as shown in [XML Data b Element] (separate window). No other possibilities are available.
Consider inserting any XML data into an XMLDB using the methods shown in [Operation 1] or [Operation 2].

[Operation 2]
After validating against the following [DTD], insert XML data (having no validation errors) into the XMLDB (do not consider the existence of a document type declaration in the XML data).
When the b element value is "null", the value of the b element is null.
When the b element value is a character string other than "null", the b element value is 1 in [XML Data b Element].
When the b element is an empty element, the b element value is 2 in [XML Data b Element].
[DTD]
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