- An SGML and XML node type, which may occur anywhere in a document, intended to carry instructions to the application. Processing instructions are exposed in the Document Object Model as
Node.PROCESSING_INSTRUCTION_NODE, and can be used in XPath and XQuery with the processing-instruction() command. An SGML processing instruction is enclosed within <? and >. An XML processing instruction is enclosed within <? and ?> and contains a target as well as (optionally) some content, which is the node value that cannot contain the sequence ?>. ← Wikipedia
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