SVGT 1.2 Tests: xml:space="preserve" in test text-align-201-t

[Kalle Raita]

Hi All,
 
This issue might have similar solution as the line-increment
for <tspan>, but here goes...
 
In test text-align-201-t <tspan> element is given attribute
xml:space="preserve". Whether this should be respected or not
is not absolutely clear.

Firstly, SVGT1.2 specification states that "SVG supports the
standard XML attribute 'xml:space' to specify the handling of
white space characters within a given text content block element's
character data", and in
<URL:http://www.w3.org/TR/SVGMobile12/intro.html#TermTextContentBlockEle
ment>
the term "text content block element" is explicitly defined to
include only <text> and <textArea>. On the other hand, the
"xml:space" attribute is listed in the attribute table
<URL:http://www.w3.org/TR/SVGMobile12/attributeTable.html#attribute_xml_
_space>
for <tspan> and <tbreak> as well, indicating the (reasonable)
assumption that it should be possible to control whitespace
handling in all SVG's text elements.

Has this been already fixed in specification version that is
under development?

Yours,
  - Kalle Raita
 

Kalle Raita
NVIDIA Corporation
Tel. [phone]
kraita@...
http://eu.nvidia.com <http://eu.nvidia.com/>  

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[Chris Lilley]

On Thursday, April 17, 2008, 4:50:11 PM, Kalle wrote:

KR> Hi All,
KR>  
KR> This issue might have similar solution as the line-increment
KR> for <tspan>, but here goes...
KR>  
KR> In test text-align-201-t <tspan> element is given attribute
KR> xml:space="preserve". Whether this should be respected or not
KR> is not absolutely clear.

KR> Firstly, SVGT1.2 specification states that "SVG supports the
KR> standard XML attribute 'xml:space' to specify the handling of
KR> white space characters within a given text content block element's
KR> character data", and in
KR> <URL:http://www.w3.org/TR/SVGMobile12/intro.html#TermTextContentBlockEle

KR> the term "text content block element" is explicitly defined to
KR> include only <text> and <textArea>. On the other hand, the
KR> "xml:space" attribute is listed in the attribute table
KR> <URL:http://www.w3.org/TR/SVGMobile12/attributeTable.html#attribute_xml_

KR> for <tspan> and <tbreak> as well, indicating the (reasonable)
KR> assumption that it should be possible to control whitespace
KR> handling in all SVG's text elements.

Your email was discussed on todays SVG WG telcon, and we agree that your assumption is both reasonable and not explicit in the spec.
http://www.w3.org/2008/05/29-svg-minutes.html#item05

We plan to correct this inconsistency in the spec, bringing the spec text into alignment with the attribute table, by modifying the text as follows:

old:
SVG supports the standard XML attribute 'xml:space' to specify the handling of white space characters within a given text content block element's character data.

new:
SVG supports the standard XML attribute 'xml:space' to specify the handling of white space characters on the character data within a given text content block element and its children.

Would that clarify things sufficiently for you?

KR> Has this been already fixed in specification version that is
KR> under development?

KR> Yours,
KR>   - Kalle Raita
KR>  

KR> Kalle Raita
KR> NVIDIA Corporation
KR> Tel. [phone]
KR> kraita@...
KR> http://eu.nvidia.com <http://eu.nvidia.com/>  

KR> -----------------------------------------------------------------------------------
KR> This email message is for the sole use of the intended recipient(s) and may contain
KR> confidential information.  Any unauthorized review, use, disclosure or distribution
KR> is prohibited.  If you are not the intended recipient, please contact the sender by
KR> reply email and destroy all copies of the original message.
KR> -----------------------------------------------------------------------------------




--
 Chris Lilley                    mailto:chris@...
 Interaction Domain Leader
 W3C Graphics Activity Lead
 Co-Chair, W3C Hypertext CG

[Kalle Raita]

Hi Chris,

The proposed change is definitely an improvement. For complete
fool-proofing
I'd suggest adding an explicit statement on which elements can
accept 'xml:space' attribute. The attribute table appendix has this
list, but the appendix is strictly speaking only informative.

My reading of the proposed text is that it clearly states that the
effect extends to children, but it does not cover which elements
react to 'xml:space'. Maybe this information can be inferred
from somewhere and I just don't see it.

Thanks for the response.

Yours,
  - Kalle

> -----Original Message-----
> From: Chris Lilley [mailto:chris@...]
> Sent: 29. toukokuuta 2008 16:40
> To: Kalle Raita
> Cc: www-svg@...
> Subject: Re: SVGT 1.2 Tests: xml:space="preserve" in test
> text-align-201-t
>
> On Thursday, April 17, 2008, 4:50:11 PM, Kalle wrote:
>
> KR> Hi All,
> KR>  
> KR> This issue might have similar solution as the line-increment
> KR> for <tspan>, but here goes...
> KR>  
> KR> In test text-align-201-t <tspan> element is given attribute
> KR> xml:space="preserve". Whether this should be respected or not
> KR> is not absolutely clear.
>
> KR> Firstly, SVGT1.2 specification states that "SVG supports the
> KR> standard XML attribute 'xml:space' to specify the handling of
> KR> white space characters within a given text content block
> element's
> KR> character data", and in
> KR>
> <URL:http://www.w3.org/TR/SVGMobile12/intro.html#TermTextConte
> ntBlockEle
>
> KR> the term "text content block element" is explicitly defined to
> KR> include only <text> and <textArea>. On the other hand, the
> KR> "xml:space" attribute is listed in the attribute table
> KR>
> <URL:http://www.w3.org/TR/SVGMobile12/attributeTable.html#attr
> ibute_xml_
>
> KR> for <tspan> and <tbreak> as well, indicating the (reasonable)
> KR> assumption that it should be possible to control whitespace
> KR> handling in all SVG's text elements.
>
> Your email was discussed on todays SVG WG telcon, and we
> agree that your assumption is both reasonable and not
> explicit in the spec.
> http://www.w3.org/2008/05/29-svg-minutes.html#item05
>
> We plan to correct this inconsistency in the spec, bringing
> the spec text into alignment with the attribute table, by
> modifying the text as follows:
>
> old:
> SVG supports the standard XML attribute 'xml:space' to
> specify the handling of white space characters within a given
> text content block element's character data.
>
> new:
> SVG supports the standard XML attribute 'xml:space' to
> specify the handling of white space characters on the
> character data within a given text content block element and
> its children.
>
> Would that clarify things sufficiently for you?
>
> KR> Has this been already fixed in specification version that is
> KR> under development?
>
> KR> Yours,
> KR>   - Kalle Raita
> KR>  
>
> KR> Kalle Raita
> KR> NVIDIA Corporation
> KR> Tel. [phone]
> KR> kraita@...
> KR> http://eu.nvidia.com <http://eu.nvidia.com/>  
>
> KR>
> --------------------------------------------------------------
> ---------------------
> KR> This email message is for the sole use of the intended
> recipient(s) and may contain
> KR> confidential information.  Any unauthorized review, use,
> disclosure or distribution
> KR> is prohibited.  If you are not the intended recipient,
> please contact the sender by
> KR> reply email and destroy all copies of the original message.
> KR>
> --------------------------------------------------------------
> ---------------------
>
>
>
>
> --
>  Chris Lilley                    mailto:chris@...
>  Interaction Domain Leader
>  W3C Graphics Activity Lead
>  Co-Chair, W3C Hypertext CG
>
>

[Erik Dahlström]

Kalle Raita wrote:

> In test text-align-201-t <tspan> element is given attribute
> xml:space="preserve". Whether this should be respected or not
> is not absolutely clear.Firstly, SVGT1.2 specification states that "SVG  
> supports thestandard XML attribute 'xml:space' to specify the handling of
> white space characters within a given text content block element's
> character data", and in
> <URL:http://www.w3.org/TR/SVGMobile12/intro.html#TermTextContentBlockEle
> ment>the term "text content block element" is explicitly defined to
> include only <text> and <textArea>.

The xml:space attribute applies to text content block element's character data (which consists of text content from its child elements). The child elements are allowed to override the parent xml:space attribute by specifying one of their own.

> On the other hand, the"xml:space" attribute is listed in the attribute  
> table
> <URL:http://www.w3.org/TR/SVGMobile12/attributeTable.html#attribute_xml_
> _space>for <tspan> and <tbreak> as well, indicating the (reasonable)
> assumption that it should be possible to control whitespace
> handling in all SVG's text elements.

That's the intent. However, note that for tbreak it won't have a visual effect since tbreak doesn't contain any textcontent that the text content block element should render.

> Has this been already fixed in specification version that is
> under development?

It has, the clarification is in this commit[1], or in the latest editors draft here[2].

Please let us know if this doesn't address your concern.
Cheers
/Erik, on behalf of the SVG WG (ACTION-2048)

[1] http://dev.w3.org/cvsweb/SVG/profiles/1.2T/publish/text.html.diff?r1=1.71&r2=1.72&f=h
[2] http://dev.w3.org/SVG/profiles/1.2T/publish/text.html#WhiteSpace