[NTG-context] Another XML question

[NTG-context] Another XML question

[Jairo A. del Rio]

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Hi, list. I want to get some attributes from <meta> nodes in a document,
but I don't get results as expected. MWE:

\starttext

\startbuffer[test]
<document>
<title>A title</title>
<meta content="Masoud Pezeshkian" name="name"></meta>
<meta content="Iran" name="country"></meta>
<meta content="surgeon" name="profession"></meta>
</document>
\stopbuffer

\startxmlsetups xml:document
\xmlattribute{#1}{/meta[name=country]}{content}
\xmlattribute{#1}{/meta[name=name]}{content}
\xmlattribute{#1}{/meta[name=profession]}{content}
\stopxmlsetups

\startxmlsetups xml:mysetups
  \xmlsetsetup{\xmldocument}{*}{-}
  \xmlsetsetup{#1}{document}{xml:*}
\stopxmlsetups

\xmlregistersetup{xml:mysetups}

\xmlprocessbuffer{main}{test}{}

\stoptext

I expected something like "IranMasoudPezeshkiansurgeon", but the "content"
attribute with name="name" repeats thrice. I tried with other cases and I
have the same result: the first result repeats. Any ideas on what's
happening? Regards

Jairo

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[NTG-context] Re: Another XML question

[Denis Maier via ntg-context]

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[NTG-context] Re: Another XML question

[Pablo Rodriguez via ntg-context]

On 3/1/26 15:05, Jairo A. del Rio wrote:
> […]
> I expected something like "IranMasoudPezeshkiansurgeon", but the
> "content" attribute with name="name" repeats thrice. I tried with other
> cases and I have the same result: the first result repeats. Any ideas on
> what's happening? Regards

Hi Jairo,

it’s in the details, lpaths expect this syntax:

   element[@attribute='value']

This is actually indepedent from `\xmlattribute`, but this is part of
the lpath/xpath selection (as already mentioned by Denis).

To get something like "Name Value: profession (country)", your relevant
code should read:

  \startxmlsetups xml:document
    \xmlattribute{#1}{meta[@name='name']}{content}:\
    \xmlattribute{#1}{meta[@name='profession']}{content}\
    (\xmlattribute{#1}{meta[@name='country']}{content})
  \stopxmlsetups

I hope it helps,

Pablo
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[NTG-context] Re: Another XML question

[Jairo A. del Rio]

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Thank you very much, Pablo! Sorry for the late answer. Since examples in
the manual weren't exactly easy to understand, I didn't realize I needed
quotes for attribute strings. Again, thanks for the remark and the example

El dom, 1 mar 2026 a la(s) 11:51 a.m., Pablo Rodriguez via ntg-context (
ntg-context@ntg.nl) escribió:

> On 3/1/26 15:05, Jairo A. del Rio wrote:
> > […]
> > I expected something like "IranMasoudPezeshkiansurgeon", but the
> > "content" attribute with name="name" repeats thrice. I tried with other
> > cases and I have the same result: the first result repeats. Any ideas on
> > what's happening? Regards
>
> Hi Jairo,
>
> it’s in the details, lpaths expect this syntax:
>
>    element[@attribute='value']
>
> This is actually indepedent from `\xmlattribute`, but this is part of
> the lpath/xpath selection (as already mentioned by Denis).
>
> To get something like "Name Value: profession (country)", your relevant
> code should read:
>
>   \startxmlsetups xml:document
>     \xmlattribute{#1}{meta[@name='name']}{content}:\
>     \xmlattribute{#1}{meta[@name='profession']}{content}\
>     (\xmlattribute{#1}{meta[@name='country']}{content})
>   \stopxmlsetups
>
> I hope it helps,
>
> Pablo
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
> webpage  : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
> archive  : https://github.com/contextgarden/context
> wiki     : https://wiki.contextgarden.net
>
> ___________________________________________________________________________________
>

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[NTG-context] Re: Another XML question

[Pablo Rodriguez via ntg-context]

On 3/4/26 03:58, Jairo A. del Rio wrote:
> Thank you very much, Pablo! Sorry for the late answer. Since examples in
> the manual weren't exactly easy to understand, I didn't realize I needed
> quotes for attribute strings. Again, thanks for the remark and the example.

Glad to read it helped, Jairo.

Of course, a delayed reply is perfectly fine.

I think “Dealing with XML in ConTeXt MkIV” (or `xml-mkiv.pdf`) is hard
to understand due to the lack of previous exposure to XPath (at least,
this was mainly my experience).

Examples from the manual may seem even too dry, but finding more verbose
and different samples belongs ot another kind of document (mainly
written by users, not by Hans).

Pablo
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[NTG-context] Re: Another XML question

[Henning Hraban Ramm]

Am 04.03.26 um 19:49 schrieb Pablo Rodriguez via ntg-context:
> I think “Dealing with XML in ConTeXt MkIV” (or `xml-mkiv.pdf`) is hard
> to understand due to the lack of previous exposure to XPath (at least,
> this was mainly my experience).

XPath (or LPath in ConTeXt) should not be hard to understand, but it is 
for me, too.

> Examples from the manual may seem even too dry, but finding more verbose
> and different samples belongs ot another kind of document (mainly
> written by users, not by Hans).

Have a look at this tutorial by Thomas Schmitz: 
https://articles.contextgarden.net/journal/2019/42-53.pdf

Hraban
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[NTG-context] Re: Another XML question

[Pablo Rodriguez via ntg-context]

On 3/4/26 21:56, Henning Hraban Ramm wrote:
> Am 04.03.26 um 19:49 schrieb Pablo Rodriguez via ntg-context:
>> I think “Dealing with XML in ConTeXt MkIV” (or `xml-mkiv.pdf`) is hard
>> to understand due to the lack of previous exposure to XPath (at least,
>> this was mainly my experience).
> 
> XPath (or LPath in ConTeXt) should not be hard to understand, but it is 
> for me, too.

It is lack of experience (at least in my case) what makes it harder to
understand, because a new mental model (or approach) is needed.

Basic CSS selectors (also implemented for XML handling) may be easier in
some cases (although, I must admit, I feel like cheating).

>> Examples from the manual may seem even too dry, but finding more verbose
>> and different samples belongs ot another kind of document (mainly
>> written by users, not by Hans).
> 
> Have a look at this tutorial by Thomas Schmitz: 
> https://articles.contextgarden.net/journal/2019/42-53.pdf

I’m afraid it doesn’t cover more complex lpaths than elements (as it
should be the case with an introductory article).

Many thanks for your helpm

Pablo
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[NTG-context] Re: Another XML question

[Hans Hagen via ntg-context]

On 3/5/2026 7:26 AM, Pablo Rodriguez via ntg-context wrote:
> On 3/4/26 21:56, Henning Hraban Ramm wrote:
>> Am 04.03.26 um 19:49 schrieb Pablo Rodriguez via ntg-context:
>>> I think “Dealing with XML in ConTeXt MkIV” (or `xml-mkiv.pdf`) is hard
>>> to understand due to the lack of previous exposure to XPath (at least,
>>> this was mainly my experience).
>>
>> XPath (or LPath in ConTeXt) should not be hard to understand, but it is
>> for me, too.
> 
> It is lack of experience (at least in my case) what makes it harder to
> understand, because a new mental model (or approach) is needed.
> 
> Basic CSS selectors (also implemented for XML handling) may be easier in
> some cases (although, I must admit, I feel like cheating).
> 
>>> Examples from the manual may seem even too dry, but finding more verbose
>>> and different samples belongs ot another kind of document (mainly
>>> written by users, not by Hans).
>>
>> Have a look at this tutorial by Thomas Schmitz:
>> https://articles.contextgarden.net/journal/2019/42-53.pdf
> 
> I’m afraid it doesn’t cover more complex lpaths than elements (as it
> should be the case with an introductory article).
> 
> Many thanks for your helpm

there are some exaples in the test suite

Hans

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[NTG-context] Re: Another XML question

[Pablo Rodriguez via ntg-context]

On 3/5/26 09:50, Hans Hagen via ntg-context wrote:
> […]
> there are some exaples in the test suite

Many thanks for the info, I think I can catch them with:

  grep -irl xmlregistersetup . | xargs xed

It would be great that the test suite could be installed and updated
with an `mtxrun --script` command, but I have already mentioned that in
a previous message.

Many thanks for your help,

Pablo
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