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diff --git a/org.simantics.fmil.core/native/FMILibrary/src/XML/src/FMI2/fmi2_xml_model_structure_impl.h b/org.simantics.fmil.core/native/FMILibrary/src/XML/src/FMI2/fmi2_xml_model_structure_impl.h
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+/*
+    Copyright (C) 2012 Modelon AB
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the BSD style license.
+
+     This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    FMILIB_License.txt file for more details.
+
+    You should have received a copy of the FMILIB_License.txt file
+    along with this program. If not, contact Modelon AB <http://www.modelon.com>.
+*/
+
+/** \file fmi2_xml_model_structure_impl.h
+*  \brief Private header file. Definitions for the model structure interface.
+*/
+
+#ifndef FMI2_XML_MODELSTRUCTURE_IMPL_H_
+#define FMI2_XML_MODELSTRUCTURE_IMPL_H_
+
+#include <FMI2/fmi2_xml_model_structure.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \brief Structure for keeping information about variable dependencies.
+*/
+typedef struct fmi2_xml_dependencies_t {
+	int isRowMajor;	/** Information is stored in row-major format flag */
+
+	/** Start index in dependency data for the corresponding row (isRowMajor=1) or column (isRowMajor = 0) */
+	jm_vector(size_t) startIndex;  
+
+	/** Column indices (isRowMajor=1) or row indices (isRowMajor=0)
+		Note that indices are 1-based. 0 has a special meaning - depends on all.
+	*/
+	jm_vector(size_t) dependencyIndex;
+	jm_vector(char)   dependencyFactorKind;
+} fmi2_xml_dependencies_t;
+
+fmi2_xml_dependencies_t* fmi2_xml_allocate_dependencies(jm_callbacks* cb);
+void fmi2_xml_free_dependencies(fmi2_xml_dependencies_t* dep);
+	
+struct fmi2_xml_model_structure_t {
+	jm_vector(jm_voidp) outputs;
+	jm_vector(jm_voidp) derivatives;
+	jm_vector(jm_voidp) discreteStates;
+	jm_vector(jm_voidp) initialUnknowns;
+
+    fmi2_xml_dependencies_t* outputDeps;
+    fmi2_xml_dependencies_t* derivativeDeps;
+    fmi2_xml_dependencies_t* discreteStateDeps;
+    fmi2_xml_dependencies_t* initialUnknownDeps;
+
+	int isValidFlag;  /**\ brief The flag is used to signal if an error was discovered and the model structure is not usable */
+};
+
+#ifdef __cplusplus
+}
+#endif
+#endif