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Re: [xml-dev] US-ASCII characters versus XML characters ... why such a huge discrepancy?
1. Before developing a schema, perhaps it would be good to understand the use-case.
--
Tony Lavinio DataDirect Technologies [email protected]
High-performance XML Processor: DataDirect XQuery http://www.xquery.com/
EDI/Flat File<->XML Converters (Java|.Net) http://www.xmlconverters.com/
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. <[email protected]> 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 [email protected]
High-performance XML Processor: DataDirect XQuery http://www.xquery.com/
EDI/Flat File<->XML Converters (Java|.Net) http://www.xmlconverters.com/
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