1、多字段连接标注

<se:Label>
    <ogc:PropertyName>YSDM</ogc:PropertyName><![CDATA[]]><ogc:PropertyName>QLRMC</ogc:PropertyName>
</se:Label>

2、多字段换行标注

<se:Label>
    <ogc:PropertyName>YSDM</ogc:PropertyName>&#x000A;<ogc:PropertyName>QLRMC</ogc:PropertyName>
</se:Label>