w3c - What is an XML processing instruction, and why is there so little information about them? -

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i couldn't google explanation them. w3 has a little paragraph them. can explain them in clear form please? used for? "processing instructions (pis) allow documents contain instructions applications" definition w3 mean? still useful or long forgotten , substituted else?

can explain them in clear form please?

that paragraph clear. provide way give application instruction.

it isn't detailed, because specifics depend on particular pi.

what used for?


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