diff --git a/palette.xsd b/palette.xsd
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+++ b/palette.xsd
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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+This specification is licensed under CC BY-SA 4.0.
+Implementing this specification in software is permitted without restriction.
+-->
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
+           targetNamespace="http://markembling.info/xmlschema/colourchooser/palette/1"
+           xmlns="http://markembling.info/xmlschema/colourchooser/palette/1"
+           elementFormDefault="qualified"
+           version="1.0.0">
+  <xs:annotation>
+    <xs:documentation>
+      Palette Format Specification
+      Version 1.0.0
+      
+      The schema for the Palette XML format, a simple format for representing
+      colour palettes.
+
+      Namespace:  http://markembling.info/xmlschema/colourchooser/palette/1
+      Spec:       https://git.markembling.info/markembling/palette-spec
+      
+      Copyright Mark Embling
+      Licensed under Creative Commons Attribution-ShareAlike 4.0 International
+      (CC BY-SA 4.0) https://creativecommons.org/licenses/by-sa/4.0/
+      
+      Implementing this specification in software, including commercial software,
+      is explicitly permitted without restriction.
+    </xs:documentation>
+  </xs:annotation>
+
+  <xs:element name="palette">
+    <xs:complexType>
+      <xs:sequence>
+        <xs:element name="colour" minOccurs="0" maxOccurs="unbounded">
+          <xs:complexType>
+            <xs:all>
+              <xs:element name="name" type="xs:string" />
+              <xs:element name="r" type="xs:unsignedByte" />
+              <xs:element name="g" type="xs:unsignedByte" />
+              <xs:element name="b" type="xs:unsignedByte" />
+              <xs:element name="opacity">
+                <xs:simpleType>
+                  <xs:restriction base="xs:unsignedByte">
+                    <xs:minInclusive value="0"></xs:minInclusive>
+                    <xs:maxInclusive value="100"></xs:maxInclusive>
+                  </xs:restriction>
+                </xs:simpleType>
+              </xs:element>
+            </xs:all>
+          </xs:complexType>
+        </xs:element>
+      </xs:sequence>
+    </xs:complexType>
+  </xs:element>
+</xs:schema>