Solr Delta Import -

we have post table

       post         postid, title, description, isdeleted, modifieddatetime 

and each post can assigned or deleted multiple tags

         tag            tagid, postid, tagvalue 

how can write sub entity tag, when delta import if tag deleted or new tag added post document should updated ?

here part of mapping.xml

      <document name="collabdocument">        <entity name="post" transformer="regextransformer" datasource="db" pk="postid"         query="select postid, title, description, createddate post isdeleted =           0"       deltaimportquery="select postid, title, description,createddate post                    postid='${dataimporter.delta.postid}'"       deltaquery="select postid post modifieddate >         ${dataimporter.last_index_time}' , isdeleted = 0"              deletedpkquery="select postid post isdeleted = 1">             <field column="postid" name="id" />       <field column="postid" name="postid" />      <field column="title" name="title" />       <field column="description" name="description" />       <field column="createddate"  name="createddate"/>                      <entity name="triples"  datasource="db" transformer="regextransformer"                 query="select group_concat(ts.value separator '|') tagvalues                 tags ts  ts.postid = ${post.postid} group ts.postid">            <field name="tagvalues" column="tagvalues" />                </entity>