[x3d-public] Agenda for X3D WG Open Meeting Wednesday 10th May 2017

[Michalis Kamburelis]

2017-05-10 18:16 GMT+02:00 Don Brutzman <brutzman at nps.edu>:
> So far so good.  Am suggesting we completely sidestep mixed cases to avoid
> confusion.
>
> a. Suggested resolution: X3D XML encoding allow MFString attribute which
> contains no quotation marks  to be treated as an SFString value.
>
> EXAMPLE
>
>    <Text string='Hello world'/>
>
> is equivalent to
>
>    <Text string='"Hello world"'/>
>
> b. Suggested addition (perhaps same as Michalis option 1) is that such
> single SFString values within an MFString are allowed to include \"
> characters.
>
> EXAMPLE (already provided in X3D XML encoding specification)
>
>     <Text string='"He said, \"Immel did it!\""' />
>
> is equivalent to
>
>     <Text string='He said, \"Immel did it!\"' />
>
> or
>     <Text string='He said, \"Immel did it!\"' />
>

This is equivalent to my 2nd proposal. Note that in

  <Text string=' "He said, \"Immel did it!\"" ' />

the backslash is *not* visible. It is only used to escape the
double-quote. This is sensible, otherwise there's no way we could
specify visible double-quote inside as MFString part in X3D XML. The
"Text" node would not be able to display double-quotes.

In case of

  <Text string='He said, \"Immel did it!\"' />

we know that

  \"

is allowed is known (it is), the question is "what does it mean":

  visible backslash + visible double quote

or

  visible double quote

Michalis

>

>
> On 5/10/2017 9:06 AM, Michalis Kamburelis wrote:
>>
>> If we change the X3D XML specification to say that
>>    <Text string="foo" />
>> means that Text.string (MFString) has a single value, and is thus equal to
>>    <Text string= ' "foo" ' />
>>
>> (extra spaces added only for readability above)
>>
>> ... then we need to be careful about backslashes. What happens here:
>>
>>    <Text string='f\"oo' />
>>
>> 1. Is the backslash here visible? (As it would be, if Text.string
>> would be SFString)?
>>
>> 2. Or not visible? (As it would be, if backslash is used for escaping,
>> as in MFString)?
>>
>> Probably 1. is better, but it's important in any case to say this
>> explicitly in the specification, also show this case as an example.
>>
>> Michalis
>>
>> 2017-05-10 17:46 GMT+02:00 Michalis Kamburelis <michalis.kambi at gmail.com>:
>>>
>>> As for "What exactly character do we mean, when we say >>single quote<<"
>>> :
>>>
>>> What does the XML standard do?
>>>
>>> XML specification https://www.w3.org/TR/REC-xml/ talks abuot
>>> single-quotes and double-quotes, and adds a lot of examples confirming
>>> that they are the same thing as familiar ASCII characters ' and ".
>>>
>>> XML specification says "apostrophe" only once, saying that
>>>
>>>    """"
>>>    the apostrophe or single-quote character (') may be represented as "
>>> ' "
>>>    """"
>>>
>>> ... so it essentially says that "apostrophe" and "single-quote
>>> character" are the same thing.
>>>
>>> Michalis
>>>
>>> 2017-05-10 17:17 GMT+02:00 Don Brutzman <brutzman at nps.edu>:
>>>>
>>>> Another reference: Mantis issue 0705.  pdf attached, link follows.
>>>>
>>>> 0705: 5.15 SFString and MFString - Escaping backslashes
>>>> http://www.web3d.org/member-only/mantis/view.php?id=705
>>>>
>>>> all the best, Don
>>>> --
>>>> Don Brutzman  Naval Postgraduate School, Code USW/Br
>>>> brutzman at nps.edu
>>>> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA
>>>> +1.831.656.2149
>>>> X3D graphics, virtual worlds, navy robotics
>>>> http://faculty.nps.edu/brutzman
>>>>
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>>>>
>
>
> all the best, Don
> --
> Don Brutzman  Naval Postgraduate School, Code USW/Br       brutzman at nps.edu
> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA   +1.831.656.2149
> X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/brutzman