c# - xpath query to select element where attribute not present -

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what should xpath query select element attribute att not present.

<root>   <elem att='the value' />   <elem att='the value' />   <elem att='the value' />   **<elem />**   <elem att='the value' />   <elem att='the value' /> </root>

i want update element attribute att not present.

thanks

you can use [@att] test presence of attribute, need:

//elem[not(@att)]

... test absence of it.

(tested using xpathtester)


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