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An [XQuery] was executed to join [eventList.xml] and [sessionUst.xml] (referenced in a separate window) and obtain the following [Expected Execution Result].
However, executing this [XQuery] resulted in an error.
Select which of the following is an appropriate example of the resulting Error Message.
Select the correct result of executing the [XQuery] on [example xml] referenced in a separate window. Do not consider indents (ignorable white space such as line feeds, tabs, etc.) in [example.xml] or the execution results.
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].
Select the correct answer that allows for a clear identification of the three different possibilities for [XML Data b Element].
[Operation 1]
After validating against the following [XML Schema], insert XML data (having no validation errors) into the XMLDB.
When no b element is present, the b element value is null.
When b element is present, the b element value is either 1 or 2 in [XML Data b Element].
[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]