diff --git a/LibMatrix.EventTypes/Events/RoomMembershipEventContent.cs b/LibMatrix.EventTypes/Events/RoomMembershipEventContent.cs
new file mode 100644
index 0000000..dac7094
--- /dev/null
+++ b/LibMatrix.EventTypes/Events/RoomMembershipEventContent.cs
@@ -0,0 +1,10 @@
+using System.Text.Json.Serialization;
+
+namespace LibMatrix.EventTypes.Events;
+
+public class RoomMembershipEventContent : MatrixEventContent {
+ public string Membership {
+ get => _json["membership"]!.GetValue<string>();
+ set => Console.WriteLine(value);
+ }
+}
\ No newline at end of file
diff --git a/LibMatrix.EventTypes/MatrixEvent.cs b/LibMatrix.EventTypes/MatrixEvent.cs
new file mode 100644
index 0000000..63f1e75
--- /dev/null
+++ b/LibMatrix.EventTypes/MatrixEvent.cs
@@ -0,0 +1,9 @@
+using System.Text.Json.Serialization;
+
+namespace LibMatrix.EventTypes;
+
+public interface IMatrixEvent<out T> where T : MatrixEventContent;
+public class MatrixEvent<T> : IMatrixEvent<T> where T : MatrixEventContent {
+ [JsonPropertyName("content")]
+ public T? Content { get; set; }
+}
\ No newline at end of file
diff --git a/LibMatrix.EventTypes/MatrixEventCollection.cs b/LibMatrix.EventTypes/MatrixEventCollection.cs
new file mode 100644
index 0000000..35afd2b
--- /dev/null
+++ b/LibMatrix.EventTypes/MatrixEventCollection.cs
@@ -0,0 +1,71 @@
+using System.Collections;
+
+namespace LibMatrix.EventTypes;
+
+public interface IMatrixEventCollection<out T> : IEnumerable<IMatrixEvent<T>> where T : MatrixEventContent {
+
+}
+public class MatrixEventCollection : IMatrixEventCollection<MatrixEventContent>, IList<MatrixEvent<MatrixEventContent> {
+ private IList<MatrixEvent<MatrixEventContent>> _listImplementation;
+ public IEnumerator<MatrixEvent<MatrixEventContent>> GetEnumerator() => _listImplementation.GetEnumerator();
+
+ IEnumerator IEnumerable.GetEnumerator() => ((IEnumerable)_listImplementation).GetEnumerator();
+
+ public void Add(MatrixEvent<MatrixEventContent> item) => _listImplementation.Add(item);
+
+ public void Clear() => _listImplementation.Clear();
+
+ public bool Contains(MatrixEvent<MatrixEventContent> item) => _listImplementation.Contains(item);
+
+ public void CopyTo(MatrixEvent<MatrixEventContent>[] array, int arrayIndex) => _listImplementation.CopyTo(array, arrayIndex);
+
+ public bool Remove(MatrixEvent<MatrixEventContent> item) => _listImplementation.Remove(item);
+
+ public int Count => _listImplementation.Count;
+
+ public bool IsReadOnly => _listImplementation.IsReadOnly;
+
+ public int IndexOf(MatrixEvent<MatrixEventContent> item) => _listImplementation.IndexOf(item);
+
+ public void Insert(int index, MatrixEvent<MatrixEventContent> item) => _listImplementation.Insert(index, item);
+
+ public void RemoveAt(int index) => _listImplementation.RemoveAt(index);
+
+ public MatrixEvent<MatrixEventContent> this[int index] {
+ get => _listImplementation[index];
+ set => _listImplementation[index] = value;
+ }
+}
+public class MatrixEventCollection<T> : IMatrixEventCollection<T>, IList<MatrixEvent<T>> where T : MatrixEventContent {
+ //TODO: implement
+
+ private IList<MatrixEvent<T>> _listImplementation = new List<MatrixEvent<T>>();
+ public IEnumerator<MatrixEvent<T>> GetEnumerator() => _listImplementation.GetEnumerator();
+
+ IEnumerator IEnumerable.GetEnumerator() => ((IEnumerable)_listImplementation).GetEnumerator();
+
+ public void Add(MatrixEvent<T> item) => _listImplementation.Add(item);
+
+ public void Clear() => _listImplementation.Clear();
+
+ public bool Contains(MatrixEvent<T> item) => _listImplementation.Contains(item);
+
+ public void CopyTo(MatrixEvent<T>[] array, int arrayIndex) => _listImplementation.CopyTo(array, arrayIndex);
+
+ public bool Remove(MatrixEvent<T> item) => _listImplementation.Remove(item);
+
+ public int Count => _listImplementation.Count;
+
+ public bool IsReadOnly => _listImplementation.IsReadOnly;
+
+ public int IndexOf(MatrixEvent<T> item) => _listImplementation.IndexOf(item);
+
+ public void Insert(int index, MatrixEvent<T> item) => _listImplementation.Insert(index, item);
+
+ public void RemoveAt(int index) => _listImplementation.RemoveAt(index);
+
+ public MatrixEvent<T> this[int index] {
+ get => _listImplementation[index];
+ set => _listImplementation[index] = value;
+ }
+}
\ No newline at end of file
diff --git a/LibMatrix.EventTypes/MatrixEventContent.cs b/LibMatrix.EventTypes/MatrixEventContent.cs
new file mode 100644
index 0000000..c30ebb0
--- /dev/null
+++ b/LibMatrix.EventTypes/MatrixEventContent.cs
@@ -0,0 +1,26 @@
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using System.Text.Json.Serialization;
+
+namespace LibMatrix.EventTypes;
+
+/// <summary>
+/// Extensible Event Content, aims to provide an API similar to JsonNode/JsonObject
+/// <seealso cref="System.Text.Json.Nodes.JsonNode"/>
+/// <seealso cref="System.Text.Json.Nodes.JsonObject"/>
+/// </summary>
+public class MatrixEventContent {
+ // <T> : MatrixEventContent where T : MatrixEventContent<T>, new() {
+ internal JsonNode _json = new JsonObject();
+
+ public static implicit operator MatrixEventContent(JsonNode json) => new(json);
+
+ [JsonConstructor]
+ public MatrixEventContent(JsonNode json) {
+ _json = json;
+ }
+
+ public MatrixEventContent() { }
+
+ public JsonNode? this[string key] => _json[key];
+}
\ No newline at end of file
diff --git a/LibMatrix.EventTypes/temp/Temp.cs b/LibMatrix.EventTypes/temp/Temp.cs
new file mode 100644
index 0000000..3fbb401
--- /dev/null
+++ b/LibMatrix.EventTypes/temp/Temp.cs
@@ -0,0 +1,17 @@
+using LibMatrix.EventTypes.Events;
+
+namespace LibMatrix.EventTypes.temp;
+
+// public class Temp {
+// public MatrixEventCollection<MatrixEventContent> Members = [
+// new MatrixEvent<RoomMembershipEventContent>() {
+// Content = new() {
+// Membership = "join"
+// }
+// }
+// ];
+//
+// public void a() {
+//
+// }
+// }
\ No newline at end of file
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