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String Concatenation in Ruta

does somebody know what is wrong with my String Concatenation in Ruta?

FOREACH (d) IngredientConcept{} {
    d{->CREATE(Entity, "label"="Drug", "value"= d.conceptID + "_" + d.dictCanon)};
    }

Caused by: org.apache.uima.ruta.extensions.RutaParseRuntimeException: Error in Anonymous, line 28, "+": expected RPAREN, but found PLUS

Thanks for your help. Philipp

您是否尝试过:“ value” =“” + d.conceptID +“ _” + d.dictCanon

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