fix: native round-trip specs

README.adoc

@@ -16,6 +16,20 @@ exchange. It is used in the DocBook and NISO JATS standards.
 This library provides a Ruby implementation of the
 https://www.oasis-open.org/specs/a503.htm[OASIS Technical Resolution TR 9503:1995].
 
+== Features
+
+* Full implementation of the OASIS Exchange Table Model TR 9503:1995
+* Intentionally excludes CALS table features not part of the Exchange subset (like `tfoot`)
+* XML serialization and deserialization
+* Validation of attribute values
+* Support for all Exchange Table Model elements:
+** `table`
+** `tgroup`
+** `colspec`
+** `thead`
+** `tbody`
+** `row`
+** `entry`
 
 == Installation
 

lib/oasis/etm/entry.rb

@@ -14,7 +14,7 @@ class Entry < Lutaml::Model::Serializable
       attribute :valign, :string, values: %w[top middle bottom]
 
       # Content
-      attribute :content, :string
+      attribute :content, :string, raw: true
 
       xml do
         root "entry"

lib/oasis/etm/table.rb

@@ -14,7 +14,7 @@ class Table < Lutaml::Model::Serializable
       attribute :tgroups, Tgroup, collection: true
 
       xml do
-        root "table"
+        root "table", ordered: true
 
         # Frame mappings
         map_attribute "frame", to: :frame

lib/oasis/etm/tgroup.rb

@@ -19,7 +19,7 @@ class Tgroup < Lutaml::Model::Serializable
       attribute :tbody, Tbody
 
       xml do
-        root "tgroup"
+        root "tgroup", ordered: true
 
         # Attribute mappings
         map_attribute "cols", to: :cols