want to change xml attribute name.

Hi, I am having an xml file. I want to change the attribute name of one node.

pub-id-type="doi">10.1163/9789004318168

Lay Prophets in Lutheran Europe (c. 1550–1700)

Brill’s Series in Church History and Religious Culture

Beyer

Jürgen

Brill

Leiden

9789004156289

9789004318168

2017

Koninklijke Brill NV incorporates the imprints Brill, Brill Hes & De Graaf, Brill Nijhoff, Brill Rodopi and Hotei Publishing.

in this i want to change the pub-id-type into book-id-type. i tried with following code. but i always got null error. what is the problem in that.

doc.XPathSelectElement("//book-meta/book-id").Attribute("pub-id-type").Remove();

doc.XPathSelectElement("//book-meta/book-id").SetAttributeValue("book-id-type", "doi");

Thanks in advance.

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