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diff --git a/org.argeo.slc.repo/src/org/eclipse/aether/artifact/Artifact.java b/org.argeo.slc.repo/src/org/eclipse/aether/artifact/Artifact.java
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@@ -0,0 +1,134 @@
+/*******************************************************************************
+ * Copyright (c) 2010, 2014 Sonatype, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Sonatype, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.aether.artifact;
+
+import java.io.File;
+import java.util.Map;
+
+/**
+ * A specific artifact. In a nutshell, an artifact has identifying coordinates and optionally a file that denotes its
+ * data. <em>Note:</em> Artifact instances are supposed to be immutable, e.g. any exposed mutator method returns a new
+ * artifact instance and leaves the original instance unchanged. <em>Note:</em> Implementors are strongly advised to
+ * inherit from {@link AbstractArtifact} instead of directly implementing this interface.
+ * 
+ * @noimplement This interface is not intended to be implemented by clients.
+ * @noextend This interface is not intended to be extended by clients.
+ */
+public interface Artifact
+{
+
+    /**
+     * Gets the group identifier of this artifact, for example "org.apache.maven".
+     * 
+     * @return The group identifier, never {@code null}.
+     */
+    String getGroupId();
+
+    /**
+     * Gets the artifact identifier of this artifact, for example "maven-model".
+     * 
+     * @return The artifact identifier, never {@code null}.
+     */
+    String getArtifactId();
+
+    /**
+     * Gets the version of this artifact, for example "1.0-20100529-1213". Note that in case of meta versions like
+     * "1.0-SNAPSHOT", the artifact's version depends on the state of the artifact. Artifacts that have been resolved or
+     * deployed will usually have the meta version expanded.
+     * 
+     * @return The version, never {@code null}.
+     */
+    String getVersion();
+
+    /**
+     * Sets the version of the artifact.
+     * 
+     * @param version The version of this artifact, may be {@code null} or empty.
+     * @return The new artifact, never {@code null}.
+     */
+    Artifact setVersion( String version );
+
+    /**
+     * Gets the base version of this artifact, for example "1.0-SNAPSHOT". In contrast to the {@link #getVersion()}, the
+     * base version will always refer to the unresolved meta version.
+     * 
+     * @return The base version, never {@code null}.
+     */
+    String getBaseVersion();
+
+    /**
+     * Determines whether this artifact uses a snapshot version.
+     * 
+     * @return {@code true} if the artifact is a snapshot, {@code false} otherwise.
+     */
+    boolean isSnapshot();
+
+    /**
+     * Gets the classifier of this artifact, for example "sources".
+     * 
+     * @return The classifier or an empty string if none, never {@code null}.
+     */
+    String getClassifier();
+
+    /**
+     * Gets the (file) extension of this artifact, for example "jar" or "tar.gz".
+     * 
+     * @return The file extension (without leading period), never {@code null}.
+     */
+    String getExtension();
+
+    /**
+     * Gets the file of this artifact. Note that only resolved artifacts have a file associated with them. In general,
+     * callers must not assume any relationship between an artifact's filename and its coordinates.
+     * 
+     * @return The file or {@code null} if the artifact isn't resolved.
+     */
+    File getFile();
+
+    /**
+     * Sets the file of the artifact.
+     * 
+     * @param file The file of the artifact, may be {@code null}
+     * @return The new artifact, never {@code null}.
+     */
+    Artifact setFile( File file );
+
+    /**
+     * Gets the specified property.
+     * 
+     * @param key The name of the property, must not be {@code null}.
+     * @param defaultValue The default value to return in case the property is not set, may be {@code null}.
+     * @return The requested property value or {@code null} if the property is not set and no default value was
+     *         provided.
+     * @see ArtifactProperties
+     */
+    String getProperty( String key, String defaultValue );
+
+    /**
+     * Gets the properties of this artifact. Clients may use these properties to associate non-persistent values with an
+     * artifact that help later processing when the artifact gets passed around within the application.
+     * 
+     * @return The (read-only) properties, never {@code null}.
+     * @see ArtifactProperties
+     */
+    Map<String, String> getProperties();
+
+    /**
+     * Sets the properties for the artifact. Note that these properties exist merely in memory and are not persisted
+     * when the artifact gets installed/deployed to a repository.
+     * 
+     * @param properties The properties for the artifact, may be {@code null}.
+     * @return The new artifact, never {@code null}.
+     * @see ArtifactProperties
+     */
+    Artifact setProperties( Map<String, String> properties );
+
+}