What is the method for parsing XML to retrieve elements that come before a specified tag?

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The method for parsing XML to retrieve elements that come before a specified tag is to use a combination of methods from an XML parser library or module in a programming language.

First, use the parser to parse the XML document and convert it into a tree-like data structure. Then, use a method to find the specified tag within the tree, and traverse backwards up the tree from that node to retrieve the elements that come before it.

This can be accomplished using methods such as getParent(), getPreviousSibling(), and getElementsByTagName() in libraries like lxml for Python or the Document Object Model (DOM) in Java.