Re: [NTG-context] btx/xml tree - entry with missing field

22 Dec 2016


      thanks a lot hans!
...
Am 22.12.2016 um 18:30 schrieb Hans Hagen :
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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