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<p>Wenke,</p>
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<p>a(v110) would mean there is no corporate author, I presume. You could add this to the index, e.g.</p>
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<p>110 0 if a(v110) then 'AU_no corporate author' fi </p>
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<p>That way you can search for all authors equal to... "no corporate author" ... This mean you still can use the normal seach interface of ABCD without having to address the database directly from the prompt with MX.</p>
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<p>Piet de Keyser</p>
<p>UC Leuven, Belgium<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>Van:</b> isis-users <isis-users-bounces+piet.dekeyser=ucll.be@iccisis.org> namens Wenke Adam <wenkeadam@gmail.com><br>
<b>Verzonden:</b> donderdag 9 maart 2017 16:01<br>
<b>Aan:</b> Isis Comunidad<br>
<b>Onderwerp:</b> [Isis-users] How to search for empty fields in ABCD</font>
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<div dir="ltr">I need to check a database for cases where a certain field is empty.
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<div>In winisis I did it simply with a free search like "? a(v110)"</div>
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<div>How can I do this within ABCD or using cisis tools?</div>
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<div>Any help will be appreciated. Thanks</div>
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<div>Wenke<br clear="all">
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<div class="gmail_signature">Wenke Adam<br>
Asesora Sistemas de Doc & Inf<br>
Santiago<br>
<div>Chile<br>
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<div>Cel: +56-9-890 21 630</div>
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