--- /dev/null
+////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2014 Realm Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////
+
+#import <Foundation/Foundation.h>
+
+#import <vector>
+
+namespace realm {
+ class Group;
+ class Query;
+ class SortDescriptor;
+}
+
+@class RLMObjectSchema, RLMProperty, RLMSchema, RLMSortDescriptor;
+class RLMClassInfo;
+
+extern NSString * const RLMPropertiesComparisonTypeMismatchException;
+extern NSString * const RLMUnsupportedTypesFoundInPropertyComparisonException;
+
+realm::Query RLMPredicateToQuery(NSPredicate *predicate, RLMObjectSchema *objectSchema,
+ RLMSchema *schema, realm::Group &group);
+
+// return property - throw for invalid column name
+RLMProperty *RLMValidatedProperty(RLMObjectSchema *objectSchema, NSString *columnName);