[NTG-context] Dynamic document variables from metadata

Hans Hagen j.hagen at xs4all.nl
Sun Jan 2 12:11:32 CET 2022


On 1/2/2022 2:54 AM, Thangalin via ntg-context wrote:
> Happy New Year!
> 
> How would you implement a mechanism that takes arbitrary XHTML <meta> 
> tags and produces document variables? Consider:
> 
>      <meta name="journal" content="Nature" />
> 
> After running XML setups, the following would write "Nature":
> 
>      \documentvariable{journal}
> 
> The tricky part is doing this without pre-defining them. Here's a short, 
> self-contained example to help demonstrate:
> 
> |\startbuffer[xdoc] <html> <head> <meta content="Milena Marić Einstein" 
> name="author"/> <meta content="Annalen der Physik" name="journal"/> 
> </head> <body> </body> </html> \stopbuffer \startxmlsetups xml:xhtml 
> \xmlsetsetup{\xmldocument}{*}{-} 
> \xmlsetsetup{\xmldocument}{html|body}{xml:*} 
> \xmlsetsetup{\xmldocument}{head}{xml:meta} \stopxmlsetups 
> \xmlregistersetup{xml:xhtml} \startxmlsetups xml:html
> % "author" is a special setup, not generalized 
> \xmlfilter{#1}{/head/meta[@name='author']/command(xml:author)} % What 
> goes here to make this dynamic? 
> %\xmlfilter{#1}{/head/meta[@name='journal']/command(xml:journal)} 
> \xmlflush{#1} \stopxmlsetups \startxmlsetups xml:author 
> \setupdocument[author={\xmlatt{#1}{content}}] 
> \setupdocument[metadata:author={\xmlatt{#1}{content}}] 
> \setupinteraction[author={\documentvariable{author}}] \stopxmlsetups % 
> How can this be generalized? %\startxmlsetups xml:journal 
> %\setupdocument[journal={\xmlatt{#1}{content}}] %\stopxmlsetups 
> \startxmlsetups xml:body \startdocument Author: 
> \documentvariable{author} \par Journal: \documentvariable{journal} 
> \stopdocument \stopxmlsetups \xmlprocessbuffer{main}{xdoc}{}|
\startxmlsetups xml:setdocumentvariable
   \setupdocument[\xmlatt{#1}{name}={\xmlatt{#1}{content}}]
\stopxmlsetups

\startxmlsetups xml:author
   \setupdocument[author={\xmlatt{#1}{content}}]
   \setupdocument[metadata:author={\xmlatt{#1}{content}}]
   \setupinteraction[author={\documentvariable{author}}]
\stopxmlsetups

\startxmlsetups xml:html
   \xmlfilter{#1}{/head/meta/command(xml:setdocumentvariable)}
   \xmlfilter{#1}{/head/meta[@name='author']/command(xml:author)}
   \startdocument
   \xmlflush{#1}
   \stopdocument
\stopxmlsetups



-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------


More information about the ntg-context mailing list