update_atomic_xml(conn, body, name, wt = "json", raw = FALSE, ...)

## Not run: 
# start Solr in Cloud mode: bin/solr start -e cloud -noprompt

# connect
(conn <- SolrClient$new())

# create a collection
if (!conn$collection_exists("books")) {
  conn$collection_delete("books")
  conn$collection_create("books")
}

# Add documents
file <- system.file("examples", "books.xml", package = "solrium")
cat(readLines(file), sep = "\n")
conn$update_xml(file, "books")

# get a document
conn$get(ids = '978-0641723445', "books", wt = "xml")

# atomic update
body <- '
<add>
 <doc>
   <field name="id">978-0641723445</field>
   <field name="genre_s" update="set">mystery</field>
   <field name="pages_i" update="inc">1</field>
 </doc>
</add>'
conn$update_atomic_xml(body, name="books")

# get the document again
conn$get(ids = '978-0641723445', "books", wt = "xml")

# another atomic update
body <- '
<add>
 <doc>
   <field name="id">978-0641723445</field>
   <field name="price" update="remove">12.5</field>
 </doc>
</add>'
conn$update_atomic_xml(body, "books")

# get the document again
conn$get(ids = '978-0641723445', "books", wt = "xml")

## End(Not run)