What is an XML document declaration?

Internet 2021-09-05 19:33:09 1 1,067

According to XML, every document must start with an XML declaration. This includes information such as declaring the version of XML and the character set used.

XML declaration is a kind of processing instruction. The processing instruction is more complicated. The XML declaration is relatively simple. To put it vividly, its function is to tell the XML processing program: “The following document is to replace the data according to the standard of the XML document.”

The declaration format of an XML document is as follows:

Note that no other characters, even spaces, are allowed in front of the XML document, which means that the XML declaration must be the first content in the XML document.

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