svg如何画有箭头的线

Question

try:   <style:style style:name="gr2"
                style:family="graphics"
                style:parent-style-name="standard">
     <style:properties draw:er-start="Circle"
                       draw:er-start-width="0.25cm"
                       draw:er-end="Arrow"
                       draw:er-end-width="0.25cm"
                       draw:textarea-horizontal-align="center"
                       draw:textarea-vertical-align="middle"/>
   </style:style>