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

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

Sorry, I'd better elaborate or it just sounds wrong:

If the context includes the namespace then the component isn't portable
by the principle that portability requires context-independence. Instead,
though, the component, if it had a namespace, could have a context-
independant namespace by moving it into a separate schema module
and assigning a namespace to that module then either including it if
the referencing schema has the same namespace or importing it if the the
referencing schema has a different namespace. You then lose the use
case of simple copy and paste though, don't you?
----
Stephen D Green



On 19 April 2011 10:48, Stephen D Green <stephengreenubl@gmail.com> wrote:
> 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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