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diff --git a/config-model/src/main/java/com/yahoo/searchdefinition/ImmutableSchema.java b/config-model/src/main/java/com/yahoo/searchdefinition/ImmutableSchema.java
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+++ b/config-model/src/main/java/com/yahoo/searchdefinition/ImmutableSchema.java
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+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.searchdefinition;
+
+import com.yahoo.config.application.api.ApplicationPackage;
+import com.yahoo.config.application.api.DeployLogger;
+import com.yahoo.config.model.api.ModelContext;
+import com.yahoo.searchdefinition.document.ImmutableSDField;
+import com.yahoo.searchdefinition.document.SDDocumentType;
+import com.yahoo.searchdefinition.document.SDField;
+import com.yahoo.vespa.documentmodel.SummaryField;
+
+import java.io.Reader;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Stream;
+
+/**
+ * An interface containing the non-mutating methods of {@link Schema}.
+ * For description of the methods see {@link Schema}.
+ *
+ * @author bjorncs
+ */
+public interface ImmutableSchema {
+
+    String getName();
+    Optional<? extends ImmutableSchema> inherited();
+    Index getIndex(String name);
+    ImmutableSDField getConcreteField(String name);
+    //TODO split in mutating/immutable by returning List<ImmutableSDField>
+    List<SDField> allConcreteFields();
+    List<Index> getExplicitIndices();
+    Reader getRankingExpression(String fileName);
+    ApplicationPackage applicationPackage();
+    DeployLogger getDeployLogger();
+    ModelContext.Properties getDeployProperties();
+    RankingConstants rankingConstants();
+    LargeRankExpressions rankExpressionFiles();
+    OnnxModels onnxModels();
+    Stream<ImmutableSDField> allImportedFields();
+    SDDocumentType getDocument();
+    ImmutableSDField getField(String name);
+
+    default Stream<ImmutableSDField> allFields() {
+        return allFieldsList().stream();
+    }
+    List<ImmutableSDField> allFieldsList();
+
+    Map<String, SummaryField> getSummaryFields(ImmutableSDField field);
+
+}