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Asked: 2026-05-18T21:06:45+00:00

I have a program that produces rather vanilla XML documents. The first line of

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I have a program that produces rather vanilla XML documents.
The first line of such generated documents is

<?xml version="1.1"?>

IE8 and Firefox both object to this, by complaining “Wrong version” and explicitly
pointing to the “1.1” part.

If I patch the first line to say:

<?xml version="1.0"?>

both of them will load/show me document without complaint.

Isn’t XML version 1.1 a standard? Do the browsers really not accept these?
Or is the error message (like with most software error messages) simply misleading and
something else is wrong?

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1 Answer

  1. Editorial Team

    XML 1.1 is not the defacto standard, no. It’s very rarely used, and unless you have a specific reason to use it, you should ignore it.

    http://en.wikipedia.org/wiki/Xml

    The second (XML 1.1) was initially published on February 4, 2004, the same day as XML 1.0 Third Edition,[32] and is currently in its second edition, as published on August 16, 2006. It contains features (some contentious) that are intended to make XML easier to use in certain cases.[33] The main changes are to enable the use of line-ending characters used on EBCDIC platforms, and the use of scripts and characters absent from Unicode 3.2. XML 1.1 is not very widely implemented and is recommended for use only by those who need its unique features.

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