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gnuplot 4.4.0 and 4.5cvs generates invalid SVG files

Dear developers,

SVG files generated by either gnuplot 4.4.0 or 4.5cvs cannot pass as
valid SVG at the W3's online validator tool (http://validator.w3.org/
check).

Take the following example:

set term svg
set out "fail.svg"
plot x
set out

Uploading the generated file will result in the error message:

"Line 81, Column 26: required attribute "xlink:href" not specified

	<a xlink:title=3D"Plot #1">

The attribute given above is required for an element that you've used,
but you have omitted it."

The same commands, processed by gnuplot 4.2.6 will result in a valid
SVG, however.

This is by no means a theoretical issue: Scribus fails to import
correctly the SVG files made by these versions of gnuplot - the tic
marks and the borders are visible, but the plot and the key are not.
In fact, the only striking difference between the valid SVG made by
4.2.6 and the broken one made by 4.4+ is this <a xlink...> tag that
wraps around the actual plot, that is, exactly those elements that are
missing from Scribus' import.

It seems that this use of <a xlink:title=3D"whatever"> is incorrect, and
frankly, I don't understand what was the intention here. To create a
link between the key and the plot? Currently it's not working that
way, and I don't see much point in making it work. If I fiddle with
the SVG file by inserting "href" and "id" definitions, and moving
around the <a> and </a> tags, I can turn either the key or the plot
into a link, but it seems that Scribus will not render anything that
is inside an <a> </a> tag.

I suggest returning to the way 4.2.6 worked.

P=E9ter Juh=E1sz

0
ISO
5/21/2010 10:50:08 PM
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Péter Juhász wrote:

> Dear developers,
> 
> SVG files generated by either gnuplot 4.4.0 or 4.5cvs cannot pass as
> valid SVG at the W3's online validator tool (http://validator.w3.org/
> check).
> 
> Take the following example:
> 
> set term svg
> set out "fail.svg"
> plot x
> set out
> 
> Uploading the generated file will result in the error message:
> 
> "Line 81, Column 26: required attribute "xlink:href" not specified
> 
> <a xlink:title="Plot #1">
> 
> The attribute given above is required for an element that you've used,
> but you have omitted it."

The xlink:title attribute is defined in the SVG 1.1 standard.
See 
   http://www.w3.org/TR/SVG11/struct.html#XLinkTitleAttribute
which leads you to here
   http://www.w3.org/TR/xlink/
in which several examples are given of data structures that contain
an xlink:title attribute but not an xlink:href attribute

That said, there's a lot in there I don't really understand :-)

I've pretty much given up on SVG.  
No two programs can agree on how it is supposed to work.

> The same commands, processed by gnuplot 4.2.6 will result in a valid
> SVG, however.
> 
> This is by no means a theoretical issue: Scribus fails to import
> correctly the SVG files made by these versions of gnuplot

Let's see.  [\me creates a test gnuplot svg file from a gnuplot demo]
- works fine in firefox
- works fine in opera
- works ok in konqueror (svg support has been wonky since KDE4)
- works fine in inkscape
- some elements missing when viewed in openoffice
- works in gimp
- scribus says "unsupported SVG feature: a"

I would conclude that the fault is in scribus.
Not exactly a bug, but a known limitation.

> It seems that this use of <a xlink:title="whatever"> is incorrect, and
> frankly, I don't understand what was the intention here. To create a
> link between the key and the plot? 

The intent was to allow an external document to link or find that specific
plot within the overall graph.  Similar to the name= or id= attribute in HTML.
In firefox and opera it causes a tooltip type of pop-up when you mouse
over the element containing the title attribute.
There's a demo on my web page showing how this works:
  http://skuld.bmsc.washington.edu/people/merritt/gnuplot/

Or at least, it used to work at the time I made it.
SVG support in konqueror degraded substantially in KDE4.
The demo still works in opera and firefox, however.

> Currently it's not working that
> way, and I don't see much point in making it work. If I fiddle with
> the SVG file by inserting "href" and "id" definitions, and moving
> around the <a> and </a> tags, I can turn either the key or the plot
> into a link, but it seems that Scribus will not render anything that
> is inside an <a> </a> tag.
> 
> I suggest returning to the way 4.2.6 worked.

Why?  Just because a feature is not yet implemented in scribus?

Actually, I feel your pain.  SVG is incredibly frustrating because,
as I said, no two programs can agree on how it should work.
That, and the design spec is missing some obvious features that would
make using it soooooo much easier (no save/restore?!).

This is not to deny that some people want to export svg from gnuplot
to specific external applications. My impression is that in order to support
this we might have to provide variant svg terminals, or maybe options on top
of the base terminal:
   set term svg {scribus | ooffice | adobe | ...}

What a pain.

	Ethan
0
sfeam
5/22/2010 7:02:19 AM
On May 22, 9:02=A0am, sfeam <sf...@users.sourceforge.net> wrote:
> P=E9ter Juh=E1sz wrote:
> > Dear developers,
>
> > SVG files generated by either gnuplot 4.4.0 or 4.5cvs cannot pass as
> > valid SVG at the W3's online validator tool (http://validator.w3.org/
> > check).
>
> > Take the following example:
>
> > set term svg
> > set out "fail.svg"
> > plot x
> > set out
>
> > Uploading the generated file will result in the error message:
>
> > "Line 81, Column 26: required attribute "xlink:href" not specified
>
> > <a xlink:title=3D"Plot #1">
>
> > The attribute given above is required for an element that you've used,
> > but you have omitted it."
>
> The xlink:title attribute is defined in the SVG 1.1 standard.
> See
> =A0 =A0http://www.w3.org/TR/SVG11/struct.html#XLinkTitleAttribute
> which leads you to here
> =A0 =A0http://www.w3.org/TR/xlink/
> in which several examples are given of data structures that contain
> an xlink:title attribute but not an xlink:href attribute
>
> That said, there's a lot in there I don't really understand :-)
>

Thanks for the detailed reply!

The standard is not immediately clear to me, either. However, the
validator seems to imply that at least in our case, the href attribute
is required for links.
But what to put into that href then? Simply putting a href=3D"" in the
<a> tag seems to appease the validator. Additionally, this
modification makes the plot element a proper clickable link in
Firefox.

An idea: we might even turn this into an useful feature! How about
allowing for an optional "link" or "href" modifier in the plot command
for svg (and possibly other, e.g. pdf) terminals, that would allow the
specification of hyperlink targets for plot elements? - Which is, as I
see, exactly what the patch linked from your web page does. So I vote
for its inclusion into the CVS version, with a slight modification:
even if the user didn't specify any href modifier, gnuplot should add
one (with dummy content, like href=3D""), in order to make the file
standards-compliant.

> I've pretty much given up on SVG. =A0
> No two programs can agree on how it is supposed to work.
>

As far as I can see, the problem is that programs implement the SVG
standard to a varying degree, with almost none of them implementing
the full standard.
Even Inkscape, which uses SVG as its default file format, says in its
roadmap that full SVG compliance is very far in the future. So you, as
a developer writing a graphic driver for SVG, cannot be sure what is
the "safe" subset of the standard that will work for everyone - any
experiment with a new feature will result in angry users claiming that
the resulting files don't work with program X (as in my case).

On the other hand, programs dealing with SVG are sometimes lenient
with not fully standard-compliant files, and what's worse, they allow
broken files to a varying, time-dependent and non-documented degree.
The net effect is what you described as wanting to give up on the
format altogether. It's a pity, really.

> > The same commands, processed by gnuplot 4.2.6 will result in a valid
> > SVG, however.
>
> > This is by no means a theoretical issue: Scribus fails to import
> > correctly the SVG files made by these versions of gnuplot
>
> Let's see. =A0[\me creates a test gnuplot svg file from a gnuplot demo]
> - works fine in firefox
> - works fine in opera
> - works ok in konqueror (svg support has been wonky since KDE4)
> - works fine in inkscape

They used to have a bug with the currentColor attribute but they've
finally fixed it in 0.47.

> - some elements missing when viewed in openoffice

Heh. Most elements are missing here.

> - works in gimp
> - scribus says "unsupported SVG feature: a"
>
> I would conclude that the fault is in scribus.
> Not exactly a bug, but a known limitation.
>

Yes, I see it now, not supporting the <a> tag altogether is their
fault at not implementing part of the standard.

> > It seems that this use of <a xlink:title=3D"whatever"> is incorrect, an=
d
> > frankly, I don't understand what was the intention here. To create a
> > link between the key and the plot?
>
> The intent was to allow an external document to link or find that specifi=
c
> plot within the overall graph. =A0Similar to the name=3D or id=3D attribu=
te in HTML.
> In firefox and opera it causes a tooltip type of pop-up when you mouse
> over the element containing the title attribute.
> There's a demo on my web page showing how this works:
> =A0http://skuld.bmsc.washington.edu/people/merritt/gnuplot/
>
> Or at least, it used to work at the time I made it.
> SVG support in konqueror degraded substantially in KDE4.
> The demo still works in opera and firefox, however.
>
> > Currently it's not working that
> > way, and I don't see much point in making it work. If I fiddle with
> > the SVG file by inserting "href" and "id" definitions, and moving
> > around the <a> and </a> tags, I can turn either the key or the plot
> > into a link, but it seems that Scribus will not render anything that
> > is inside an <a> </a> tag.
>
> > I suggest returning to the way 4.2.6 worked.
>
> Why? =A0Just because a feature is not yet implemented in scribus?
>
> Actually, I feel your pain. =A0SVG is incredibly frustrating because,
> as I said, no two programs can agree on how it should work.
> That, and the design spec is missing some obvious features that would
> make using it soooooo much easier (no save/restore?!).
>
> This is not to deny that some people want to export svg from gnuplot
> to specific external applications. My impression is that in order to supp=
ort
> this we might have to provide variant svg terminals, or maybe options on =
top
> of the base terminal:
> =A0 =A0set term svg {scribus | ooffice | adobe | ...}
>

I don't think that would be a good idea: it would cause confusion for
the user, and it would be an unmaintainable mess for the developers.
(As I've said above, the various programs' support for the various
features of the SVG standard changes with time: new versions might fix
one problem while introducing others. Trying to follow this would be a
nightmare).

The only reasonable choice I see is to follow the standard, even if
others don't.
If the standards require the presence of the href tag, then include it
- even if most software seem to do without it.
Even better, the patch (http://sourceforge.net/tracker/index.php?
func=3Ddetail&aid=3D2172587&group_id=3D2055&atid=3D302055) could be include=
d
in the CVS version, or even in 4.4.1, as it introduces an useful
feature while it doesn't break any existing one (I think).

And I'll go to the Scribus developers with my import problem.

> What a pain.
>

Indeed.

P=E9ter Juh=E1sz

> =A0 =A0 =A0 =A0 Ethan

0
ISO
5/22/2010 1:17:07 PM
Péter Juhász wrote:

> On May 22, 9:02 am, sfeam <sf...@users.sourceforge.net> wrote:
>> Péter Juhász wrote:
>> > Dear developers,
>>
>> > SVG files generated by either gnuplot 4.4.0 or 4.5cvs cannot pass
>> > as valid SVG at the W3's online validator tool
>> > (http://validator.w3.org/ check).

>> > Uploading the generated file will result in the error message:
>>
>> > "Line 81, Column 26: required attribute "xlink:href" not specified
>>
>> > <a xlink:title="Plot #1">
>>
>> > The attribute given above is required for an element that you've
>> > used, but you have omitted it."
>>
>> The xlink:title attribute is defined in the SVG 1.1 standard.
>> See
>> http://www.w3.org/TR/SVG11/struct.html#XLinkTitleAttribute
>> which leads you to here
>> http://www.w3.org/TR/xlink/
>> in which several examples are given of data structures that contain
>> an xlink:title attribute but not an xlink:href attribute
>>
>> That said, there's a lot in there I don't really understand :-)
>>
> 
> Thanks for the detailed reply!
> 
> The standard is not immediately clear to me, either. However, the
> validator seems to imply that at least in our case, the href attribute
> is required for links.
> But what to put into that href then? Simply putting a href="" in the
> <a> tag seems to appease the validator. Additionally, this
> modification makes the plot element a proper clickable link in
> Firefox.

There are two functionalities involved.  One is the ability to embed
a link to an external URL from inside the SVG document.  That's what
<a href=URL> is for.  The complementary functionality is to assign an
anchor to a section of the document so that an external entity can link
_into_ it.  That's what <a href=title> is for.    At least that's the
way I understand it, by analogy to the equivalent href/name tags in HTML.

The w3.org validator is complaining that there is no outgoing link.
But there wasn't intended to be an outgoing link, so I think this is a
false alarm.

> An idea: we might even turn this into an useful feature! How about
> allowing for an optional "link" or "href" modifier in the plot command
> for svg (and possibly other, e.g. pdf) terminals, that would allow the
> specification of hyperlink targets for plot elements? - Which is, as I
> see, exactly what the patch linked from your web page does. So I vote
> for its inclusion into the CVS version, with a slight modification:
> even if the user didn't specify any href modifier, gnuplot should add
> one (with dummy content, like href=""), in order to make the file
> standards-compliant.

A recursive link does not sound like a great idea to me.
 
> The only reasonable choice I see is to follow the standard, even if
> others don't.
> If the standards require the presence of the href tag, then include it
> - even if most software seem to do without it.

I am not convinced that the standard requires it.  As I pointed out
initially, the on-line documentation at www.w3.org gives examples of
xlink being used without an href tag.  Admittedly, those examples are
convoluted. I may be missing some inheritence rule that causes an href
link to be attached to the data structure even though it doesn't provide
one by itself.

> Even better, the patch (http://sourceforge.net/tracker/index.php?
> func=detail&aid=2172587&group_id=2055&atid=302055) could be included
> in the CVS version, or even in 4.4.1, as it introduces an useful
> feature while it doesn't break any existing one (I think).

My view is that it won't be ready for inclusion in CVS until the user-
visible calling mechanism is finalized. Right now the patch only handles
SVG and epslatex output.  The concern is that some details of the interface
might need to be changed in order to work with, say, cairo or HTML5 
output.  I'd rather have it working on those first before adding it to
CVS, or at least block out the cairo/HTML5 support far enough to see
that it is going to work without revising the whole approach.



	Ethan

0
sfeam
5/22/2010 3:13:56 PM
Reply:

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Hi, Group I require a copy of the above DOS, but I need it _on disk_ as I do not have an emulator for the Model II that must be tested. Is there any possible sources of the OS on disk, or can you advise if the original 8" drive can be hooked to another device so that I can transfer an electronic copy to the disk to boot the machine? What other options do I have? Thanks L replying to my own post :-) I found an article here (http://www.tim-mann.org/trs80resources.html) where Tim describes a trick to rescue a disk's contents. This should be a workable solution...

gnuplot 4.1 #4
I am running a release from late spring of the above under OS/2 -- was/is there a problem with the fill algorithm circles overlap in a plot? All circles do not fill in my plots -- I use "with points pt 7 ps variable". ...

Howto update gnuplot from version 4.2 to version 4.4?
I install gnuplot 4.2 patchlevel 5 at my Slackware 12.2. I need update my gnuplot's version, but I don't know how. I install gnuplot by it's own 'make install' process. Help me How do I update gnuplot? I think uninstall gnuplot 4.2 after to install gnuplot 4.4. But at slackware doesn't work removepkg, or slackpkg remove. On 1 abr, 18:38, mfduqued <mfduq...@gmail.com> wrote: > I install gnuplot 4.2 patchlevel 5 at my Slackware 12.2. I need update > my gnuplot's version, but I don't know how. I install gnuplot by it's > own 'ma...

KitKat 4.4.4
All about the latest Android update http://www.gottabemobile.com/2014/06/20/android-4-4-4-kitkat-update-breakdown/ Larry wrote, on Wed, 25 Jun 2014 04:56:04 +1000: > All about the latest Android update > http://www.gottabemobile.com/2014/06/20/android-4-4-4-kitkat-update-breakdown/ I've had it on my Moto G for a while now, and, well, the only obvious things are the message app is very oddly different and there is a new emergency contact alarm system that drove me crazy with messages when I tested it out, but, I guess, it will work in dire emergencies. ...

1/4 to 4/4
TblCustomer CustomerID CustomerName TblOrder OrderID CustomerID OrderDate From the above tables, how do I write a query that returns the following for each customer: CustomerA Order 1/4 CustomerA Order 2/4 CustomerA Order 3/4 CustomerA Order 4/4 Where CustomerA is the customer name, Order is text, CustomerA placed 4 orders and the orders are sequenced by OrderDate in chronological order. Thanks! Carl Carl, you could use a pair of subqueries to count how many orders there are in total for the customer, and which one this is. You would type something like this into the Field row in qu...

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<html> <head> <meta name="GENERATOR" content="Microsoft FrontPage 5.0"> <meta name="ProgId" content="FrontPage.Editor.Document"> <meta http-equiv="Content-Type" content="text/html; charset=ks_c_5601-1987"> <title>�� ������ 1</title> <meta name="Microsoft Theme" content="network 011, default"> </head> <body> <table cellpadding='0' cellspacing='0' border='0'> <tr> <td height=5...

color codes changed from gnuplot 4.0 to 4.2?
We're seeing strange results after upgrading to gnuplot 4.2 from 4.0. It seems that the color codes must have changed. Can anyone point me to documentation about this? Is there a configuration file that would allow 4.2 to exhibit 4.0 behavior? Are there other known issues with migrating to 4.2 from 4.0? Thanks to all for any insight, and thanks to the gnuplot team for their good work on this useful tool. Josh Josh T wrote: > We're seeing strange results after upgrading to gnuplot 4.2 from 4.0. > It seems that the color codes must have changed. Possibly....

[ace-users] Re: [tao-support] Has ACE 5.4.4/TAO 1.4.4 been built with gcc 4.0.0 yet
Hi Robert, > When building ACE 5.4.4/TAO 1.4.4 using gcc 4.0.0 under fedora core > 4 test 2 on an x86 platform I get a lot of errors mainly to do with > template instantiations. Has anyone successfully build TAO/ACE using > the latest gcc ? We just added GCC 4.0.0 support to ACE+TAO recently. The forthcoming x.4.5 beta should work nicely with GCC 4.0.0. We hope to have this available very shortly (there's just one remaining snag with typecodes that should be fixed in the next day or so). If you'd like to give things a try before we release x.4.5 please download the contents of ACE+TAO from our CVS repo at http://cvs.doc.wustl.edu/ and see if it works for you on your platform. If not, please let us know and we'll try to make sure that it's working before we put out the beta release. Thanks, Doug I've tried the CVS version on macosx 10.4, with gcc4.0 and still got the same intantiation problem. On 5/9/05, Douglas C. Schmidt <schmidt@cs.wustl.edu> wrote: > > Hi Robert, > > > When building ACE 5.4.4/TAO 1.4.4 using gcc 4.0.0 under fedora core > > 4 test 2 on an x86 platform I get a lot of errors mainly to do with > > template instantiations. Has anyone successfully build TAO/ACE using > > the latest gcc ? > > We just added GCC 4.0.0 support to ACE+TAO recently. The forthcoming > x.4.5 beta should work nicely with GCC 4.0.0. We hope to ha...

4:2:2 to 4:4:4 conversion
Hi, I have subsampled 4:4:4 image using 15-tap filter into 4:2:2 image. Now, in order to view 4:2:2 image, I need to convert it back into 4:4:4 image. I have repeated the chroma samples to create chroma values for alternate luma samples erstwhile without chroma. However, I am doubtful of the method. Do I need to interpolate to create the missing chroma samples? What is generally done in such a scenario?? Regards, Ajay "Ajay" <mishraka@gmail.com> wrote in message news:1113558255.605980.208160@z14g2000cwz.googlegroups.com... > Hi, > > I have subsampled 4:4:4 image ...

Apache 2.0.4.6 (Win) PHP 4.3.4.4
Hello there, We have PHP ver 4.3.4.4 working off Apache server version 2.0.4.6. My developer has developed a bunch of basic web pages which interact with the SQL Server 2000. We exposed the web application to the outside world though port 80 and the server crashed all of a sudden the very next day. Are there any security vulneribities with PHP ver 4.3.4.4 and Apache server version 2.0.4.6.which I need to be aware off. My developer is reluctant to upgrade the server to new version of apache and php. Any suggestion, help or pointer in the right direction will be appreciated. Thanks, anup...

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