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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Doesn't the list of allowable characters shown in the XML
 At 2021-04-15 12:51 +0000, Roger L Costello wrote: The XML specification says that these are the codepoints for the characters that are allowed in XML documents: Not quite. Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]The specification says that a "parsed entity contains text, a sequence of characters", and "a character is an atomic unit of text as specified by ISO/IEC 10646. Legal characters are tab, character return, line feed, and legal characters of Unicode and ISO/IEC 10646". https://www.w3.org/TR/xml/#charsets Separately, 4.3.3 states "In the document entity, the encoding declaration is part of the XML declaration". https://www.w3.org/TR/xml/#charencoding What if the XML documents aren't encoded using a Unicode character encoding scheme, then what are the allowable characters?The encoding of the document entity is independent of the repertoire of allowable characters. If the document entity expresses a character that is not in the list of allowable characters, then the document is not well-formed. For example, in Unicode the codepoint #x9 corresponds to the "horizontal tab" character but in EBCDIC hex 9 corresponds to the "begin superscript" character. Is the XML specification saying that an XML document using EBCDIC can use the invisible "begin superscript" character but not the "horizontal tab" character? Or, is it saying that am I expected, when using a character encoding scheme other than Unicode, to convert the above list of Unicode codepoints to the corresponding characters in the non-Unicode character encoding scheme? For example, in EBCDIC the "horizontal tab" character is 5.Neither. The specification is saying that a document entity has an encoding that is independent of the definition of the text allowed in XML parsed entities. To get the character you want in XML (as defined by Unicode) use the encoding you need in your document (as defined by the XML Declaration). If you try to say it using your own words, you may end up confusing the reader. I suggest you cite the specification. I hope this is helpful. . . . . . Ken /Roger _______________________________________________________________________ XML-DEV is a publicly archived, unmoderated list hosted by OASIS to support XML implementation and development. To minimize spam in the archives, you must subscribe before posting. [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ Or unsubscribe: xml-dev-unsubscribe@lists.xml.org subscribe: xml-dev-subscribe@lists.xml.org List archive: http://lists.xml.org/archives/xml-dev/ List Guidelines: http://www.oasis-open.org/maillists/guidelines.php -- Contact info, blog, articles, etc. http://www.CraneSoftwrights.com/x/ | Check our site for free XML, XSLT, XSL-FO and UBL developer resources | Streaming hands-on XSLT/XPath 2 training class @US$125 (5 hours free) | Essays (UBL, XML, etc.) http://www.linkedin.com/today/author/gkholman |  [Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] |
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