XPath find all elements with specific child node

Question

Could you please help me to find all the elements b which have the child element c in the example below?

Answer 1

Whenever the structure of the XML document is known, it is better to avoid using the // XPath pseudo-operator, as its use can result in big inefficiency (traversal of the whole document tree).

Therefore, I recomment this XPath expression for the provided XML document:

/*/b[c]

This selects any b element that is a child of the top element of the XML document and that has a child-element named c.

UPDATE: The OP asked a second question just minutes ago:

The second question is I want to combine 2 conditions: I want to get the element which have name = "b2" and has the element c But this syntax seems not to work: //b[@name='b2' and c]

The provided XPath expression does select exactly the wanted element.

Here is XSLT - based verification:

When this transformation is applied on the provided XML document:

the XPath expression is evaluated and the correctly-selected element is copied to the output: