XPath to find element based on another XPath element

I have an Java AST and I try to find a variable inside it via XPath.

Lets say the variable is called 'foobar' I could use

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//VariableDeclarator/VariableDeclaratorId[@Image='foobar']

but what if I dont know the text 'foobar', but want to read it from another element

//VariableDeclarator/VariableDeclaratorId[@Image=//SynchronizedStatement/Expression/PrimaryExpression/PrimaryPrefix/Name]

the 'Name' node has the information 'foobar' in @Image, but PrimaryPrefix/Name[@Image] does not work.

How must I rewrite the condition //SynchronizedStatement/Expression/PrimaryExpression/PrimaryPrefix/Name that it is the same as @Image='foobar' ?

Thanks

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Try this XPath:-

//VariableDeclarator/VariableDeclaratorId[@Image=//SynchronizedStatement/Expression/PrimaryExpression/PrimaryPrefix/Name/@Image]