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

22 Dec 2016


      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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