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Add / Insert Child Using XSLT

I have the following situation:

I need to add a child element to an existing XML tag.

my current XML looks like this: it contains an empty (self-closing) " <attr tag=.../>":

<?xml version="1.0" encoding="UTF-8"?>
<dataset>
...
<attr tag="00081110" vr="SQ" pos="-1" name="Referenced Study Sequence" len="-1"/>
...
</dataset>

after conversion it should look something like this: 2 children added / inserted (wrapped by the element <item>):

<?xml version="1.0" encoding="UTF-8"?>
<dataset>
...
<attr tag="00081110" vr="SQ" pos="-1" name="Referenced Study Sequence" len="-1">
  <item id="1" pos="28" len="-1">
    <attr tag="00081150" vr="UI" pos="36" name="Referenced SOP Class UID" vm="0" len="3">991</attr>
    <attr tag="00081155" vr="UI" pos="44" name="Referenced SOP Instance UID" vm="0" len="3">992</attr>
  </item>
</attr>

...
</dataset>

How can i achieve this? I tried various random settings, but in my best shot I ended up replacing the parent (tag = "00081110") with a child.

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<xsl:template match="attr">
  <xsl:copy>
    <xsl:copy-of select="@*" />

    <item id="1" pos="28" len="-1">
      <attr tag="00081150" vr="UI" pos="36" name="Referenced SOP Class UID" vm="0" len="3">991</attr>
      <attr tag="00081155" vr="UI" pos="44" name="Referenced SOP Instance UID" vm="0" len="3">992</attr>
    </item>

  </xsl:copy>
</xsl:template>
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