XML Schema Datatype Questions
dpotter at mitre.org
Thu Dec 30 16:10:54 GMT 1999
I am currently developing a type checker designed to validate data in an
instance document corresponding to an XML schema. I have a few
questions about the datatype spec I am hoping someone can answer.
First question, what is Not A Number in respect to the float/double
datatypes? Or, rather, what is it in relationship to a min/max range?
If I specify that mininclusive=0 and maxinclusive=INF, then is NAN in
that range? What about mininclusive=-3 and maxexclusive=4? Or does NAN
need to be specified in the enumeration? (On that note, can the
enumeration facet be used to allow values outside the range specified by
min/max to be included? Or do enumeration values need to fall within
the range? There is no constraint saying that enumeration and min/max
values cannot be set together, which leads me to believe that they are
combined to describe legal values.)
In other words, if I specify a range of values, does NAN ever fall in
that range? Or does it need to be specified as a legal value through
the enumeration facet?
Also relating to float, are the characters case sensitive? Can I use
"inf" as a value or does it need to be "INF"? Is "6.22e22" legal? Or
does it need to be "6.22E22"?
One last question: For the binary datatype, what is the default
encoding? According to the encoding facet, it must be either hex or
base64, but what happens if the user doesn't specify? If I specify that
an element is of type binary, but leave out the encoding facet, what
encoding is then used? As far as I can tell, there is no default value
for encoding. I would assume hex is default because it is listed first,
but it would be nice to know for certain which encoding is truely
intended as default.
Thanks for any help.
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