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Below are few examples of using different expressions of XPath to fetch some information from xml document.In this query, we using XMLTable function to parse the XML content from Employees table.It can also index scalar node values, to provide quick lookup based on individual values or ranges of values.
XPath uses a path expression to select nodes or list of node from a xml document.
Heres a list of useful paths and expression that can be used to select any node/nodelist from a xml document.
One of its main purposes is to overcome the indexing limitation presented by unstructured and hybrid storage of XML data, that is, CLOB storage.
It does this by indexing the XML tags of your document and identifying document fragments based on XPath expressions that target them.
Here is a link that shows the code for a function to replace in a clob.