[VuFind-Tech] Multiple values within institutional fields

[Gonzalo F. <gon...@gm...>]

Simple question:

While importing MARC records I want to load multiple string values to Solr
"collection" field. I guess it should be quite simple, but cannot figure it
out.
I've tried comma separated values, key as an array (collection[]),
duplicated declaration, etc, but none of them are working as expected

Institutional fields are configured as multiValue at my Solr schema.xml, as
default:

   <!-- Institutional Fields -->
   <field name="institution" type="string" indexed="true" stored="true"
multiValued="true"/>
   <field name="collection" type="string" indexed="true" stored="true"
multiValued="true"/>
   <field name="building" type="string" indexed="true" stored="true"
multiValued="true"/>

Thanks in advance,

Gonzalo