Querying null / empty values in complex properties
With such a schema
<ubx_convention:avis>
<item>
<instance>Instance Centrales/Conseil d'administration</instance>
<date>2014-10-09T22:00:00.00Z</date>
</item>
<item>
<instance>Instance opérat/Conseil d'UF xxx</instance>
<date/>
</item>
</ubx_convention:avis>
How can I build a query that returns documents that do not hold at least a void / empty / null date ?
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