Re: [xml-dev] RE: ANN: Portable Data Component -- start/end

[Stephen D Green <stephengreenubl@gmail.com>]

If this is the case, that context-dependence violates portability,
then do namespaces violate portability too?
----
Stephen D Green



On 19 April 2011 10:05, Costello, Roger L. <costello@mitre.org> wrote:
> David Lee wrote:
>
>> Time alone assumes a date is present in the context
>
> Ah, excellent point David.
>
> And, by definition, a portable data component does not depend on context. Therefore, specifying the movie using only time values violates the principle of portability. Do you agree?
>
> /Roger
>
>
> -----Original Message-----
> From: David Lee [mailto:dlee@calldei.com]
> Sent: Monday, April 18, 2011 3:27 PM
> To: Costello, Roger L.; xml-dev@lists.xml.org
> Subject: RE: [xml-dev] RE: ANN: Portable Data Component -- start/end
>
> "Who's at fault"
> Anyone who thinks using Time values instead of datetime values for actual
> instances of a temporal point is at fault.
> Time alone assumes a date is present in the context (either explicitly, or
> as an occurrence etc).
> Time alone can never specify a temporal point anymore more than an "x" value
> alone can specify a point in 2D space or a fraction can specify a decimal.
>
>
>
>
>
>
>
> ----------------------------------------
> David A. Lee
> dlee@calldei.com
> http://www.xmlsh.org
>
> -----Original Message-----
> From: Costello, Roger L. [mailto:costello@mitre.org]
> Sent: Monday, April 18, 2011 2:19 PM
> To: xml-dev@lists.xml.org
> Subject: [xml-dev] RE: ANN: Portable Data Component -- start/end
>
>
> Hi Folks,
>
> Suppose that a person records the start time and end time of a movie, which
> starts at 11pm and ends at 1am the next day:
>
>    <movie>
>        <start>23:00:00</start>
>        <end>01:00:00</end>
>    </movie>
>
> Validating that against the portable start/end data component (see below)
> results in this error: "movie does not match the assertion".
>
> Had the movie times been specified using dateTime:
>
>    <movie>
>        <start>2011-04-16T23:00:00</start>
>        <end>2011-04-17T01:00:00</end>
>    </movie>
>
> then there would be no error.
>
> QUESTION
>
> Who's at fault?
>
>    - The person who specified the movie times using just time values?
>    - Or, the portable start/end data component for throwing an error on
> perfectly good movie times?
>
> /Roger
>
> P.S. Here's the portable start/end data component:
>
>    <xs:complexType name="start-end-date-time">
>        <xs:sequence>
>            <xs:element name="start">
>                <xs:simpleType>
>                    <xs:union memberTypes="xs:date xs:time
>                                           xs:dateTime" />
>                </xs:simpleType>
>            </xs:element>
>            <xs:element name="end" minOccurs="0">
>                <xs:simpleType>
>                    <xs:union memberTypes="xs:date xs:time
>                                           xs:dateTime" />
>                </xs:simpleType>
>            </xs:element>
>        </xs:sequence>
>        <xs:assert test="
>              if (exists(end)) then
>                  if (start castable as xs:dateTime) then
>                      xs:dateTime(end) gt xs:dateTime(start)
>                  else if (start castable as xs:date) then
>                      xs:date(end) gt xs:date(start)
>                  else if (start castable as xs:time) then
>                      xs:time(end) gt xs:time(start)
>                  else true()
>              else true()" />
>    </xs:complexType>
>
> Comments welcome.
>
> /Roger
>
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