Processing instructions are used in XML to keep processor-specific information in the text of the document.
The XML declaration that appears at the top of an XML document, typically
<?xml version='1.0' encoding='UTF-8'?>, is treated by QDom as a processing instruction. This is unfortunate, since the XML declaration is not a processing instruction; among other differences, it cannot be inserted into a document anywhere but on the first line.
Do not use this function to create an xml declaration, since although it has the same syntax as a processing instruction, it isn’t, and might not be treated by QDom as such.
Constructs an empty processing instruction. Use
createProcessingInstruction()to create a processing instruction with content.
- Return type
Returns the content of this processing instruction.
d – str
Sets the data contained in the processing instruction to
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