* Chris Lilley wrote:
BH> Consider a *UTF-8 encoded* document
BH>
BH> Content-Type: application/xml;charset=iso-8859-1
BH>
BH> <?xml version="1.0"?>
BH> ...
BH> <!--Björn-->
BH> ...
BH>
BH> With no BOM and using only US-ASCII characters for the rest of the
BH> document,
So in this case, although the processor that generated it is non
conforming, the content is not non conforming (but it should be) and the
processor that receives it has two possibilities:
I've actually asked to get a better understanding on how you intend to
change RFC3023, yet I am afraid you did not really say what happens with
the document above if RFC3023bis gets approved with your changes. I
would appreciate to know just a, b, c, or what else for the various
cases.
b) it can note that a required encoding declaration is not present, and
throw a well formedness error.
It actually can't, 0xC3 0xB6 is a legal sequence in both UTF-8 and
ISO-8859-1, it would need to know that I meant to have "Björn" in the
comment which it cannot know.
Consider an *8859-1 encoded* document
Content-Type: application/xml;charset=UTF-8
<?xml version="1.0"?>
...
<!--Björn-->
...
With your proposal, would the well formedness error (bytes occur that
cannot occur in UTF-8) be silently recovered from if the HTTP
header overrides it, even for an XML processor, while it would continue
to fail in other cases (such as server side processing)?
I do not really think I've made a proposal to change RFC3023 other than
that the differences between text/xml and application/xml are removed to
properly reflect running code. I can only tell you what XML 1.0 and RFC
3023 require in these cases but you know that already.
It would sometimes be b) and sometimes c) depending on the particular
software and whether its reading from disk on the server or over the
net. I frankly can't understand how you consider this lack of
interoperability to be a desirable thing.
I am in fact most interested to learn how you think this can be improved
upon which is why I asked you about the impact of your proposal for the
various cases I've mentioned. What applications currently do does not
really help me to get a better understanding of that.