diff --git a/01.workspace/heave/src/lib.rs b/01.workspace/heave/src/lib.rs
index 7e685c6..d91f43c 100644
--- a/01.workspace/heave/src/lib.rs
+++ b/01.workspace/heave/src/lib.rs
@@ -10,3 +10,5 @@ mod tst;
 pub use crate::str::attribute::O as Attribute;
 pub use crate::str::entity::O as Entity;
 pub use crate::str::value::E as Value;
+pub use crate::trt::from_eav::T as FromEAV;
+pub use crate::trt::to_eav::T as ToEAV;
diff --git a/01.workspace/heave/src/trt/from_eav.rs b/01.workspace/heave/src/trt/from_eav.rs
new file mode 100644
index 0000000..3b5335a
--- /dev/null
+++ b/01.workspace/heave/src/trt/from_eav.rs
@@ -0,0 +1,5 @@
+use crate::*;
+
+pub trait T {
+    fn from_eav(entity: Entity) -> Self;
+}
diff --git a/01.workspace/heave/src/trt/mod.rs b/01.workspace/heave/src/trt/mod.rs
index 8b13789..651c8e9 100644
--- a/01.workspace/heave/src/trt/mod.rs
+++ b/01.workspace/heave/src/trt/mod.rs
@@ -1 +1,2 @@
-
+pub mod from_eav;
+pub mod to_eav;
diff --git a/01.workspace/heave/src/trt/to_eav.rs b/01.workspace/heave/src/trt/to_eav.rs
new file mode 100644
index 0000000..1b33173
--- /dev/null
+++ b/01.workspace/heave/src/trt/to_eav.rs
@@ -0,0 +1,5 @@
+use crate::*;
+
+pub trait T {
+    fn to_eav(self) -> Entity;
+}