xsl:for-each - How to format list?

I am new at this so please forgive me if I am being ignorant. This is a sample of my XML data.

<record ID="ART5843">
  <title>This is a sample record</title>
  <edition></edition>
  <persauthorfull>Lykins, Amy D.</persauthorfull>
  <persauthorfull>Cantor, James M.</persauthorfull>
  <persauthorfull>Blanchard, Ray</persauthorfull>
  <keywords>Generic</keywords>
  <keywords>Criminal offences</keywords>
  <keywords>Civil offences</keywords>
  <keywords>Men</keywords>
  <keywords>Psychology</keywords>
  <keywords>Research</keywords>
  <subjects></subjects>
</record>

I need the <persauthorfull> to rename to <PA> and then to output on a single line separated by semi-colon, such...

<PA>Lykins, Amy D.; Cantor, James M.; Blanchard, Ray</PA>

I am using XSL for-each to extract the names, but I have no idea of how to format them.

<xsl:for-each select="a:persauthorfull">
  <PA>
    <xsl:attribute name="type">
    <xsl:value-of select="."/>
    </xsl:attribute>
  </PA>
</xsl:for-each> 

From what I am surmising this is a single iteration over the author - is there another way?