YamlOutput writeSequenceDelim() throws IOException
    {
        tail = sink.writeByteArray(
                DASH_AND_SPACE,
                this,
                newLine(
                        indent,
                        sink,
                        this,
                        tail));

        indent = inc(indent, 2);
        return this;
    }
Before serializing a message/object tied to a schema, this should be called.
protostuff-yaml/src/main/java/io/protostuff/YamlOutput.java