[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: [Summary #2] Why is Encoding Metadata (e.g. encoding="UTF-
"Whitespace may preceed an XML declaration, so an XML parser will parse through the whitespace bytes until it arrives at the start of the XML declaration." This (whitespace before XML declaration) is not allowed by the EBNF productions defining a well-formed XML Document: http://www.w3.org/TR/REC-xml/#sec-well-formed -- "By this point an XML parser will know the endianness and byte-size being used by the document's encoding. So it can parse the XML declaration!" It think there is a fast shortcut here, as shown in examples by Philippe Poulard and Richard Tobin. As a side note, you do not mention how the parser figures out whether there is an XML declaration or not. -- "Since XML support only a finite set of character encodings the problem is tractable." XML _processors_ may support only a finite set of character encodings. The XML recommendation does not restrict the possible encodings, but mentions [1] that: "It is RECOMMENDED that character encodings registered (as charsets) with the Internet Assigned Numbers Authority [IANA-CHARSETS], other than those just listed, be referred to using their registered names; other encodings SHOULD use names starting with an "x-" prefix." and "processors are, of course, not required to support all IANA-registered encodings." [1] http://www.w3.org/TR/REC-xml/#charencoding [2] [IANA-CHARSETS] http://www.iana.org/assignments/character-sets -- some typos "may preceed an XML declaration" "may be found in the XML 1.0 Recomendation" Regards, Eric Bréchemier On 9/21/07, Costello, Roger L. <costello@m...> wrote: > Hi Folks, > > Excellent discussion! Thank you! > > Here is the updated document, based on my understanding of all your > comments: > > http://www.xfront.com/specifying-encoding/ > > As always, please let me know of any errors or unclear parts. > > /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@l... > subscribe: xml-dev-subscribe@l... > List archive: http://lists.xml.org/archives/xml-dev/ > List Guidelines: http://www.oasis-open.org/maillists/guidelines.php > >
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