- From: Frank Steimke <f-steimke@b...>
- To: xml-dev@l...
- Date: Sat, 29 Jan 2022 17:51:27 +0100
Agreed.
Coming back to the request from Rick ("show me in the massive
XML standard (without resorting to any other layer or standard)
how to say that some specific string (i.e an attribute value or
element contents) containing digits is a number, say a decimal
number"), my conclusion is: Production Rule 26 together with
the Quotations from the Standard is an Example of "how to
say that some specific string containing digits is a number".
It tells us that this particular String is a version number.
However, I admit that this seems to be the only example where the
XML standard assigns the semantics of a number to a string. And i
know, it's a bit of a cheat, because it's a string inside the XML
Declaration.
Greetings, Frank
Am 29.01.22 um 15:36 schrieb Michael
Kay:
There are statements elsewhere about the semantics:
[Definition: XML documents should begin with an XML declaration which
specifies the version of XML being used.]
And
this provides a context within which readers are likely to
understand what "version number" means. Without this context,
it could easily be the version of the vocabulary, or the
version of the instance document.
Michael
Kay
Saxonica
It is true that the quoted sentence
presupposes a basic understanding on the part of the
reader of what is meant by "version number". But
without this basic understanding the whole
specification would have no meaning at all.
After all, the sentence is normative. For
what reason does the XML specification make statements
about permissible values of the attribute if it is
completely unclear what its semantic should be?
Greetings,
Frank
Am 29.01.22 um 10:53
schrieb Michael Kay:
Section 2.8 Prolog and Document
Type Declaration Production Rule 26
VersionNum together with the following note,
which explains the semantic of VersionNum as
a decimal Number:
"Even though the VersionNum
production matches any version number of the
form '1.x', XML 1.0 documents SHOULD NOT
specify a version number other than '1.0'."
Greetings,
Frank
That doesn't say anything about the
semantics of the version number, it just gives some
constraints on its value. It doesn't say what
information it conveys: for all this sentence says,
VersionNum tells you the number of phone calls made
on an average day by the document author.
Michael Kay
Saxonica
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