ProcessingInstruction
ProcessingInstruction is a node type within the Document Object Model (DOM) that represents processing instructions in an XML or HTML document. These instructions are not part of the document's content itself but rather provide information to applications that process the document. A processing instruction consists of a target, which is the name of the application or processor to which the instruction is directed, and data, which is the content of the instruction.
The syntax for a processing instruction in XML is `<?target data?>`. For example, `<?xml-stylesheet type="text/css" href="style.css"?>`
When a processing instruction is encountered by a DOM parser, it is represented as a ProcessingInstruction