Re: btx/xml tree - entry with missing field

[Hans Hagen <pragma@wxs.nl>]

On 12/22/2016 6:06 PM, Michael Eidenbenz wrote:
> Hello
>
> I use the xml interface to list all publications that dont match a
> search criteria:
>
>      /field[@name='keywords'
>             and not (contains(text(),'alpha'))]
>
> but there are entries where the keywords field is missing.
> how can I include them (here "test-3") in the output?
>
> Thanks Michael
>
> --------------------------
>
> \startbuffer[bib]
>
> @article{test-1,
>    title    = {Article One},
>    author   = {A. Foo and X. Bar},
>    year     = {2001},
>    keywords = {alpha},
> }
>
> @book{test-2,
>    title    = {Book Two},
>    author   = {B. Foo},
>    year     = {2002},
>    keywords = {beta},
> }
>
> @whatever{test-3,
>    title    = {Book Three},
>    author   = {C. Foo},
>    year     = {2003},
> }
>
> \stopbuffer
>
> \usebtxdataset [database] [bib.buffer]
> \convertbtxdatasettoxml [database]
>
> \startxmlsetups btx:tag
> \hbox{\xmlatt{#1}{tag}}
> \stopxmlsetups
>
> \startxmlsetups btx:demo
>    \xmlfilter {#1} {
>      /bibtex
>      /*
>      /field[@name='keywords'
>             and not (contains(text(),'alpha'))]
>      /..
>      /command(btx:tag)
>    }
> \stopxmlsetups
>
> \starttext
> \xmlsetup{btx:database}{btx:demo}
> \stoptext

\startxmlsetups btx:demo
    \xmlfilter {#1} {/bibtex/*/command(btx:demo:action)}
\stopxmlsetups

\startxmlsetups btx:demo:action
     \xmldoifelse {#1} {/field[@name='keywords']} {
         \xmlfilter {#1} {
              /field[@name='keywords'
                     and not contains(text(),'alpha')]
              /..
              /command(btx:tag)
         }
     } {
         \xmlsetup{#1}{btx:tag}
    }
\stopxmlsetups


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                                           Hans Hagen | PRAGMA ADE
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