diff --git a/xml_schema_derive/src/xsd/extension.rs b/xml_schema_derive/src/xsd/extension.rs
index 27d2b47..536787f 100644
--- a/xml_schema_derive/src/xsd/extension.rs
+++ b/xml_schema_derive/src/xsd/extension.rs
@@ -1,6 +1,6 @@
 use crate::xsd::{
-  attribute::Attribute, rust_types_mapping::RustTypesMapping, sequence::Sequence, Implementation,
-  XsdContext,
+  attribute::Attribute, group::Group, rust_types_mapping::RustTypesMapping, sequence::Sequence,
+  Implementation, XsdContext,
 };
 use proc_macro2::TokenStream;
 
@@ -17,6 +17,8 @@ pub struct Extension {
   pub attributes: Vec<Attribute>,
   #[yaserde(rename = "sequence")]
   pub sequences: Vec<Sequence>,
+  #[yaserde(rename = "group")]
+  pub group: Option<Group>,
 }
 
 impl Implementation for Extension {
@@ -34,7 +36,7 @@ impl Implementation for Extension {
       .map(|attribute| attribute.implement(namespace_definition, prefix, context))
       .collect();
 
-    let inner_attribute = if format!("{rust_type}") == "String" {
+let inner_attribute = if format!("{rust_type}") == "String" {
       quote!(#[yaserde(text)])
     } else {
       TokenStream::new()
@@ -42,7 +44,7 @@ impl Implementation for Extension {
 
     quote!(
       #inner_attribute
-      pub content: #rust_type,
+      pub base: #rust_type,
       #attributes
     )
   }
@@ -52,10 +54,28 @@ impl Extension {
   pub fn get_field_implementation(
     &self,
     context: &XsdContext,
-    _prefix: &Option<String>,
+    prefix: &Option<String>,
   ) -> TokenStream {
     let rust_type = RustTypesMapping::get(context, &self.base);
-    quote!(pub content : #rust_type)
+
+    let group_content = self
+      .group
+      .as_ref()
+      .map(|group| {
+        let group_type = group.get_type_implementation(context, prefix);
+
+        quote!(
+          ,
+          #[serde(flatten)]
+          pub extension : #group_type
+        )
+      })
+      .unwrap_or_default();
+
+    quote!(
+      pub base : #rust_type
+      #group_content
+    )
   }
 }
 
@@ -70,6 +90,7 @@ mod tests {
       base: "xs:string".to_string(),
       attributes: vec![],
       sequences: vec![],
+      group: None,
     };
 
     let context =
@@ -112,6 +133,7 @@ mod tests {
         },
       ],
       sequences: vec![],
+      group: None,
     };
 
     let context =
diff --git a/xml_schema_derive/src/xsd/group.rs b/xml_schema_derive/src/xsd/group.rs
new file mode 100644
index 0000000..e0eec34
--- /dev/null
+++ b/xml_schema_derive/src/xsd/group.rs
@@ -0,0 +1,108 @@
+use crate::xsd::{
+  rust_types_mapping::RustTypesMapping, sequence::Sequence, Implementation, XsdContext,
+};
+use heck::ToUpperCamelCase;
+use proc_macro2::{Span, TokenStream};
+use syn::Ident;
+
+#[derive(Clone, Default, Debug, PartialEq, YaDeserialize)]
+#[yaserde(prefix = "xs", namespace = "xs: http://www.w3.org/2001/XMLSchema")]
+pub struct Group {
+  #[yaserde(attribute)]
+  pub name: Option<String>,
+  #[yaserde(attribute, rename = "ref")]
+  pub reference: Option<String>,
+  #[yaserde()]
+  pub sequence: Option<Sequence>,
+}
+
+impl Implementation for Group {
+  fn implement(
+    &self,
+    namespace_definition: &TokenStream,
+    prefix: &Option<String>,
+    context: &XsdContext,
+  ) -> TokenStream {
+    if self.name.is_none() {
+      return quote!();
+    }
+    let raw_name = self.name.clone().unwrap();
+
+    let struct_name = Ident::new(&raw_name.to_upper_camel_case(), Span::call_site());
+
+    let fields = self
+      .sequence
+      .as_ref()
+      .map(|sequence| sequence.get_field_implementation(context, prefix))
+      .unwrap_or_default();
+
+    quote!(
+      #[derive(Clone, Debug, Default, PartialEq, serde::Deserialize, serde::Serialize)]
+      #namespace_definition
+      pub struct #struct_name {
+        #fields
+      }
+    )
+  }
+}
+
+impl Group {
+  pub fn get_type_implementation(
+    &self,
+    context: &XsdContext,
+    _prefix: &Option<String>,
+  ) -> TokenStream {
+    if let Some(reference) = &self.reference {
+      RustTypesMapping::get(context, reference)
+    } else {
+      panic!("Missing reference for group");
+    }
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  use yaserde::de::from_str;
+
+  #[test]
+  fn check_group_implementation() {
+    let xml = r#"
+        <group name="groupthing">
+          <sequence>
+            <element name="CX_X" type="asdfg"/>
+            <element name="CY_X" type="asdfg"/>
+          </sequence>
+        </group>
+    "#;
+
+    let group: Group = from_str(xml).unwrap();
+
+    let context =
+      XsdContext::new(r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"></xs:schema>"#)
+        .unwrap();
+
+    let implementation = format!("{}", group.implement(&TokenStream::new(), &None, &context));
+
+    assert_eq!(implementation, "# [derive (Clone , Debug , Default , PartialEq , serde :: Deserialize , serde :: Serialize)] \
+pub struct Groupthing { \
+# [yaserde (rename = \"CX_X\")] pub cx_x : xml_schema_types :: Asdfg , \
+# [yaserde (rename = \"CY_X\")] pub cy_x : xml_schema_types :: Asdfg , }");
+  }
+
+  #[test]
+  fn check_group_ref() {
+    let xml = r#"<group ref="bla:groupthing" />"#;
+
+    let group: Group = from_str(xml).unwrap();
+
+    let context =
+      XsdContext::new(r#"<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"></xs:schema>"#)
+        .unwrap();
+
+    let type_implementation = format!("{}", group.get_type_implementation(&context, &None));
+
+    assert_eq!(type_implementation, "Groupthing");
+  }
+}
diff --git a/xml_schema_derive/src/xsd/mod.rs b/xml_schema_derive/src/xsd/mod.rs
index a3eb8e1..43811b4 100644
--- a/xml_schema_derive/src/xsd/mod.rs
+++ b/xml_schema_derive/src/xsd/mod.rs
@@ -5,6 +5,7 @@ mod complex_content;
 mod complex_type;
 mod element;
 mod extension;
+mod group;
 mod import;
 mod list;
 mod max_occurences;
diff --git a/xml_schema_derive/src/xsd/schema.rs b/xml_schema_derive/src/xsd/schema.rs
index 8966828..e14ec5f 100644
--- a/xml_schema_derive/src/xsd/schema.rs
+++ b/xml_schema_derive/src/xsd/schema.rs
@@ -1,5 +1,5 @@
-use crate::xsd::{
-  attribute, attribute_group, complex_type, element, import, qualification, simple_type,
+  use crate::xsd::{
+  attribute, attribute_group, complex_type, element, group, import, qualification, simple_type,
   Implementation, XsdContext,
 };
 use proc_macro2::TokenStream;
@@ -29,6 +29,8 @@ pub struct Schema {
   pub attributes: Vec<attribute::Attribute>,
   #[yaserde(rename = "attributeGroup")]
   pub attribute_group: Vec<attribute_group::AttributeGroup>,
+  #[yaserde(rename = "group")]
+  pub group: Vec<group::Group>,
 }
 
 impl Implementation for Schema {
@@ -71,10 +73,23 @@ impl Implementation for Schema {
         .collect()
     };
 
+    log::info!("Generate groups");
+    let groups: TokenStream = {
+      let mut context = context.clone();
+      context.set_is_in_sub_module(true);
+
+      self
+        .group
+        .iter()
+        .map(|group| group.implement(&namespace_definition, target_prefix, &context))
+        .collect()
+    };
+
     quote!(
       pub mod xml_schema_types {
         #simple_types
         #complex_types
+        #groups
       }
 
       #elements