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+
+# RFC: Theme Specification: Level 2
+
+The current specification is intentionally limited in scope to allow for extension and interpretation for how typography, color, layout and other values are grouped and defined.
+This allows for some level of interoperability among the different libraries that adhere to the spec, but does not ensure interoperability of the theme objects themselves.
+
+This proposal is for an optional specification that defines a schema for some of the individual scales in a theme object.
+This is intended to make themes swappable and allow for transformations for use in libraries that do not adhere to this exact specification.
+
+For the purposes of this document, the term *level 1* is used to reference the current theme specification as-is,
+and the term *level 2* is this optional specification that builds on top of the current specification's foundation.
+
+## Schema
+
+While the overall object is still intended to be extensible, the following keys should be defined in a theme that conforms to level 2.
+Additional, user-defined keys may be added to each scale as needed.
+
+```
+{
+  colors: {
+    text: String,
+    background: String,
+    primary: String,
+    secondary: String,
+    accent: String,
+    muted: String,
+  },
+  fonts: {
+    body: String,
+    heading: String,
+    monospace: String,
+  },
+  fontWeights: {
+    body: String or Number,
+    heading: String or Number,
+    bold: String or Number,
+  },
+  lineHeights: {
+    body: String or Number,
+    heading: String or Number,
+  },
+  fontSizes: Array (length 10),
+  space: Array (length 10),
+}
+```
+