xml1

<presence from='{Jane}@public.talk.google.com/android{UNIQUE_ID}'
to='{me}@gmail.com'>
    <status/>
    <show>available</show>
    <!-- metadata truncated for brevity -->
</presence>

<presence from='{John}@gmail.com/gmail{UNIQUE_ID}' to='{me}@gmail.com'>
    <status/>
    <show>available</show>
    <!-- metadata truncated for brevity -->
</presence>

xml2

<presence type='unavailable'
from='{John}@gmail.com/gmail{UNIQUE_ID}' to='{me}@gmail.com'>
    <status/>
    <!-- metadata truncated for brevity -->
</presence>

xml3

<presence from='{Jane}@public.talk.google.com/android{UNIQUE_ID}'
to='{me}@gmail.com'>
    <status/>
    <show>available</show>
    <!-- metadata truncated for brevity -->
</presence>

xml4

<presence from='{Jane}@public.talk.google.com/android{UNIQUE_ID}'
to='{me}@gmail.com'>
    <status/>
    <show>available</show>
    <!-- metadata truncated for brevity -->
</presence>

(... one minute later ...)
    
<presence from='{Jane}@public.talk.google.com/android{UNIQUE_ID}'
to='{me}@gmail.com'>
    <status/>
    <show>away</show>
    <!-- metadata truncated for brevity -->
</presence>