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diff --git a/backend/InstanceVersion.h b/backend/InstanceVersion.h
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+/* Copyright 2013 MultiMC Contributors
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include <QObject>
+
+#include "libmmc_config.h"
+
+class InstVersionList;
+
+/*!
+ * An abstract base class for instance versions.
+ * InstVersions hold information about versions such as their names, identifiers,
+ * types, etc.
+ */
+class LIBMULTIMC_EXPORT InstVersion : public QObject
+{
+	Q_OBJECT
+	
+	/*!
+	 * A string used to identify this version in config files.
+	 * This should be unique within the version list or shenanigans will occur.
+	 */
+	Q_PROPERTY(QString descriptor READ descriptor CONSTANT)
+	
+	/*!
+	 * The name of this version as it is displayed to the user.
+	 * For example: "1.5.1"
+	 */
+	Q_PROPERTY(QString name READ name)
+	
+	/*!
+	 * The name of this version's type as it is displayed to the user.
+	 * For example: "Latest Version", "Snapshot", or "MCNostalgia"
+	 */
+	Q_PROPERTY(QString typeName READ typeName)
+	
+	/*!
+	 * Gets the version's timestamp.
+	 * This is primarily used for sorting versions in a list.
+	 */
+	Q_PROPERTY(qint64 timestamp READ timestamp)
+	
+	
+public:
+	/*!
+	 * \brief Constructs a new InstVersion with the given parent. 
+	 * The parent *must* be the InstVersionList that contains this InstVersion. 
+	 * The InstVersion will be added to the list immediately after being created.
+	 */
+	explicit InstVersion(const QString &descriptor, 
+						 const QString &name,
+						 qint64 timestamp,
+						 InstVersionList *parent = 0);
+	
+	/*!
+	 * Copy constructor.
+	 * If the 'parent' parameter is not NULL, sets this version's parent to the
+	 * specified object, rather than setting it to the same parent as the version
+	 * we're copying from.
+	 * \param other The version to copy.
+	 * \param parent If not NULL, will be set as the new version object's parent.
+	 */
+	InstVersion(const InstVersion &other, QObject *parent = 0);
+	
+	virtual QString descriptor() const;
+	virtual QString name() const;
+	virtual QString typeName() const = 0;
+	virtual qint64 timestamp() const;
+	
+	virtual InstVersionList *versionList() const;
+	
+	/*!
+	 * Creates a copy of this version with a different parent.
+	 * \param newParent The parent QObject of the copy.
+	 * \return A new, identical copy of this version with the given parent set.
+	 */
+	virtual InstVersion *copyVersion(InstVersionList *newParent) const = 0;
+	
+	/*!
+	 * Checks if this version is less (older) than the given version.
+	 * \param other The version to compare this one to.
+	 * \return True if this version is older than the given version.
+	 */
+	virtual bool isLessThan(const InstVersion &other) const;
+	
+	/*!
+	 * Checks if this version is greater (newer) than the given version.
+	 * \param other The version to compare this one to.
+	 * \return True if this version is newer than the given version.
+	 */
+	virtual bool isGreaterThan(const InstVersion &other) const;
+	
+	/*!
+	 * \sa shouldSortBefore()
+	 */
+	virtual bool operator<(const InstVersion &rhs) { return isLessThan(rhs); }
+	
+	/*!
+	 * \sa shouldSortAfter()
+	 */
+	virtual bool operator>(const InstVersion &rhs) { return isGreaterThan(rhs); }
+	
+protected:
+	QString m_descriptor;
+	QString m_name;
+	qint64 m_timestamp;
+};