Re: [xml-dev] US-ASCII characters versus XML characters ... why sucha hu

[Tony Lavinio <alavinio@gmail.com>]

1. Before developing a schema, perhaps it would be good to understand the use-case.

2. The XML 1.1 specification allows these characters. <http://www.w3.org/TR/2004/REC-xml11-20040204/#charsets>

3. If you're going to add support for these to XML 1.0, what about NULLs?

4. If they are needed, perhaps wrapping in a PI would be better? Like <?hex 00?>

5. If a message has a block of binary data, would it be better to just turn the whole think into a base-64 or hexBinary string?

Without understanding what the purpose is, it's hard to make a recommendation.

On Mon, Oct 1, 2012 at 9:59 AM, Costello, Roger L. <costello@mitre.org> wrote:

Hi Folks,

Below is a table that shows the US-ASCII characters (decimal value) in the left column and the right column indicates whether the character is allowed in XML documents.

Questions:

1. Why does XML not support many of the US-ASCII characters? Of the 127 US-ASCII characters, 28 characters are not allowed in XML documents; that is, 22% of the US-ASCII characters are not supported by XML.

2. I am creating an XML Schema for an RFC that allows all 127 US-ASCII characters. What should I do for the 28 US-ASCII characters that are supported by the RFC but not supported by XML?


Decimal value of
US-ASCII character | Is an XML character?
------------------------------------------
    1              |  No
    2              |  No
    3              |  No
    4              |  No
    5              |  No
    6              |  No
    7              |  No
    8              |  No
    9              |  Yes
   10             |  Yes
   11             |  No
   12             |  No
   13             |  Yes
   14             |  No
   15             |  No
   16             |  No
   17             |  No
   18             |  No
   19             |  No
   20             |  No
   21             |  No
   22             |  No
   23             |  No
   24             |  No
   25             |  No
   26             |  No
   27             |  No
   28             |  No
   29             |  No
   30             |  No
   31             |  No
   32-127    |  Yes

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Tony Lavinio       DataDirect Technologies       alavinio@datadirect.com
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