<glissando> (Single)

<measure number="18">
   <note default-x="82">
      <pitch>
         <step>F</step>
         <octave>4</octave>
      </pitch>
      <duration>2</duration>
      <voice>1</voice>
      <type>quarter</type>
      <stem default-y="0">up</stem>
      <staff>1</staff>
      <notations>
         <glissando line-type="wavy" number="1" type="start"/>
      </notations>
   </note>
   <note default-x="136">
      <pitch>
         <step>G</step>
         <octave>5</octave>
      </pitch>
      <duration>2</duration>
      <voice>1</voice>
      <type>quarter</type>
      <stem default-y="-30">down</stem>
      <staff>1</staff>
      <notations>
         <glissando line-type="wavy" number="1" type="stop"/>
      </notations>
   </note>
</measure>