This flag determines if processing instructions (nodes with type node_pi; such nodes have the form of <? target content ?> or <? target ?> in XML) are to be put in DOM tree. If this flag is off, they are not put in the tree, but are still parsed and checked for correctness. The corresponding node in DOM tree will have type node_pi, name "target" and value "content", if any. Note that <?xml ...?> (document declaration) is not considered to be a PI. This flag is off by default.
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