Re: [xml-dev] Question on XML Schema 1.1 [vc:maxVersion]

[Mukul Gandhi <gandhi.mukul@gmail.com>]

On Tue, Jan 11, 2011 at 3:59 AM, Ramkumar Menon
<ramkumar.menon@gmail.com> wrote:
>  a) Why did we chose to have maxVersion be exclusive of the value?
>      i.e.
>    <element name="Price" vc:minVersion="1.1" vc:maxVersion="2.4"/>
>    Its tricky for a person to read this as
>    "Price" element will be removed on pre-processing if we are using XSD
> version 2.4.

I agree with you that this could be confusing.

But here are few points I can think of why this could be so:

1) I find having vc:maxVersion to be exclusive of value to have more
semantic correctness, than allowing vc:maxVersion to be equal to the
value.
2) I believe making vc:maxVersion exclusive of the value would cause
the schema in question less likely to break in future.

> b) Are we assuming that version numbers for XML Schema MUST be decimals, now
> and later? Exposing terms such as minVersion and maxVersion indicate so.

The vc:maxVersion and vc:minVersion numbers are xs:decimal as
specified in the spec [1]. Although I feel, the value space of
xs:decimal is probably too large for a concept like vc:maxVersion and
vc:minVersion, but xs:decimal seems to be the most appropriate
built-in type for these attributes.

[1] http://www.w3.org/TR/xmlschema11-1/#cip
<quote>
    Where they appear, the attributes vc:minVersion and vc:maxVersion
are treated as if declared with type xs:decimal.
</quote>




-- 
Regards,
Mukul Gandhi