We called the \() on the XML element and asked it to look for all symbol elements. It returns an instance of scala.xml.NodeSeq, which represents a collection of XML nodes.
The \() method looks only for the elements that are direct descendants of the target element(i.e symbol). If we want to search through all the elements in the hierarchy starting from the target element, \\() method is used
Check it out, especially if you’re working with Spark, as you never know when a rogue XML file will head your way.