Xpath: find a node that has a given attribute whose value contains a string

Question

Is there an xpath way to search for a node that has a given attribute whose value contains the given string?

For example, I have an XML document and you want to find a node where the address attribute contains the string Downing , so that I could find the following node:

 <person name="blair" address="10 Downing St. London"/> 

Answer 1

 select="//*[contains(@address,'Downing')]"