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Why for Our XML Parser Does selectSingleNode return NULL When the xmlns Attribute is Added?

April 26, 2017added null parser Return selectsinglenode XML xmlns

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Why for Our XML Parser Does selectSingleNode return NULL When the xmlns Attribute is Added?

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Our code parses an XML file that is an instance of our own XML schema ApplicationStructure. It works fine, until we add xmlns=”http://www.oracle.com/JHeadstart/ApplicationStructure” in the top-level tag. Then the call to selectSingleNode suddenly returns NULL. If we remove the xmlns attribute, selectSingleNode again returns the node we want.