private void consumeLabels() {
            if ( ! consumeOptional('{')) return;
            while ( ! consumeOptional('}')) {
                String dimension = consumeIdentifier();
                consume(':');
                consumeLabel();
                builder.mapped(dimension);
                consumeOptional(',');
            }
        }
Consumes a mapped address into a set of the type builder
vespajlib/src/main/java/com/yahoo/tensor/TensorParser.java