XPath uses path expressions to select nodes or node-sets in an XML document.
In XPath, there are seven kinds of nodes: element, attribute, text, namespace, processing-instruction, comment, and document nodes.
XML documents are treated as trees of nodes. The topmost element of the tree is called the root element.
/ -->Selects from the root node
// -->Selects nodes in the document from the current node that match the selection no matter where they are
. -->Selects the current node
.. -->Selects the parent of the current node
@ -->Selects attributes
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