diff --git a/idl/GCObject.json5 b/idl/GCObject.json5
deleted file mode 100644
index e826af2..0000000
--- a/idl/GCObject.json5
+++ /dev/null
@@ -1,59 +0,0 @@
-{
-    mode: "facet",
-    includes: [],
-    namespace1: "xo",
-    namespace2: "scm",
-    facet: "GCObject",
-    detail_subdir: "detail",
-    brief: "xxx",
-    using_doxygen: true,
-    doc: [
-        "GC hooks for collector-aware data"
-    ],
-    types: [
-        // using size_type = std::size_t
-        {
-            name: "size_type",
-            doc: ["type for an amount of memory"],
-            definition: "std::size_t",
-        },
-    ],
-    const_methods: [
-        // size_type shallow_size() const noexcept
-        {
-            name: "shallow_size",
-            doc: ["memory consumption for this instance"],
-            return_type: "size_type",
-            args: [],
-            const: true,
-            noexcept: true,
-            attributes: [],
-        },
-        // Opaque shallow_copy(obj<AAllocator>>) const noexcept
-        {
-            name: "shallow_copy",
-            doc: ["copy instance using allocator"],
-            return_type: "Opaque",
-            args:[
-                {types: "obj<AAllocator>", name: "mm"},
-            ],
-            const: true,
-            noexcept: true,
-            attributes: [],
-        },
-    ],
-    nonconst_methods: [
-        // size_type forward_children(obj<ACollector>) const noexcept
-        {
-            name: "size_type",
-            doc: ["during GC: forward immdiate children"].
-            return_type: "size_type",
-            args: [
-                {types: "obj<ACollector>", name: "gc"},
-            ],
-            const: true,
-            noexcept: true,
-            attributes: [],
-        },
-    ],
-}
\ No newline at end of file