using fosi to format pseudo elements

I created pseudo elements in my document with ACL:

<?Pub _source_data><?Pub _rqrd_item

attr1="source2" attr2="Required Source Data Item"><?Pub /_rqrd_item><?Pub

_src_item attr1="source1" attr2="value1"><?Pub /_src_item><?Pub _src_item

attr1="source3" attr2="value3"><?Pub /_src_item><?Pub /_source_data>

I am trying to use the FOSI to format these elements:

<e-i-c gi="_source_data">

<charlist charsubsetref="standalone">

<usetext source="\SOURCE DATA:\" placemnt="after">

<subchars charsubsetref="gentext"></subchars>

</usetext>

</charlist>

</e-i-c>

I can't seem to get it to work.  Am I missing something.  I am using PTC 5.3.