diff --git a/convention-plugin/src/main/kotlin/org/metaborg/convention/MavenPublishConventionExtension.kt b/convention-plugin/src/main/kotlin/org/metaborg/convention/MavenPublishConventionExtension.kt
new file mode 100644
index 0000000..b62d35e
--- /dev/null
+++ b/convention-plugin/src/main/kotlin/org/metaborg/convention/MavenPublishConventionExtension.kt
@@ -0,0 +1,113 @@
+package org.metaborg.convention
+
+import org.gradle.api.Action
+import org.gradle.api.model.ObjectFactory
+import org.gradle.api.provider.ListProperty
+import org.gradle.api.provider.Property
+import org.gradle.kotlin.dsl.newInstance
+import javax.inject.Inject
+
+/**
+ * Configuration for the Maven Publish convention.
+ *
+ * Create an instance like this:
+ *
+ * ```kotlin
+ * extensions.create<MavenPublishConventionExtension>("mavenPublishConvention")
+ * extension.setConvention()
+ * ```
+ */
+open class MavenPublishConventionExtension @Inject constructor(
+    /** The Gradle object factory. */
+    objects: ObjectFactory,
+) {
+    /** The owner of the repository. */
+    val repoOwner: Property<String> = objects.property(String::class.java)
+    /** The name of the repository. */
+    val repoName: Property<String> = objects.property(String::class.java)
+
+    /** Whether to publish to GitHub packages. */
+    val publishToGitHubPackages: Property<Boolean> = objects.property(Boolean::class.java)
+    /** Whether to publish to Metaborg Artifacts. */
+    val publishToMetaborgArtifacts: Property<Boolean> = objects.property(Boolean::class.java)
+
+    /** The publication metadata (dot notation). */
+    val metadata: MetadataHandler = objects.newInstance<MetadataHandler>()
+
+    /** The publication metadata (DSL notation). */
+    fun metadata(action: Action<MetadataHandler>) {
+        action.execute(metadata)
+    }
+
+    /**
+     * Sets the convention (default values) for the configuration extension.
+     */
+    fun setConvention() {
+        publishToGitHubPackages.convention(metadata.scm.map { it == SCM.GitHub })
+        publishToMetaborgArtifacts.convention(true)
+        metadata.setConvention()
+    }
+
+    /** Configuration of publication metadata. */
+    interface MetadataHandler {
+        /** The year the project was started. */
+        val inceptionYear: Property<String>
+        /** The developers of the project. */
+        val developers: ListProperty<Developer>
+        /** The source control management system. */
+        val scm: Property<SCM>
+        /** The open source license that the project is published under. */
+        val license: Property<OpenSourceLicense>
+        /** The HTTP SCM URL format. */
+        val httpUrlFormat: Property<String>
+        /** The SCM URL format. */
+        val scmUrlFormat: Property<String>
+
+        /**
+         * Sets the convention (default values) for the configuration extension.
+         */
+        fun setConvention() {
+            scm.convention(SCM.GitHub)
+            license.convention(OpenSourceLicense.Apache2)
+            httpUrlFormat.convention(scm.map { it.httpUrlFormat })
+            scmUrlFormat.convention(scm.map { it.scmUrlFormat })
+        }
+    }
+}
+
+
+/** Specifies a developer. */
+data class Developer(
+    /** The developer's ID or username. */
+    val id: String,
+    /** The developer's full name. */
+    val name: String,
+    /** The developer's email address. */
+    val email: String,
+)
+
+
+/** Specifies a source control management system. */
+enum class SCM(
+    /** The HTTP URL for the SCM. */
+    val httpUrlFormat: String,
+    /** The SCM URL for the SCM. */
+    val scmUrlFormat: String,
+) {
+    /** GitHub */
+    GitHub("https://github.com/%s/%s", "scm:git@github.com:%s/%s.git"),
+}
+
+
+/** Specifies the open source license. */
+enum class OpenSourceLicense(
+    /** The unique identifier of the license. */
+    val id: String,
+    /** The license URL. */
+    val url: String,
+) {
+    // From: https://spdx.org/licenses/
+
+    /** Apache 2 */
+    Apache2("Apache-2.0", "https://www.apache.org/licenses/LICENSE-2.0.txt"),
+}
\ No newline at end of file
diff --git a/convention-plugin/src/main/kotlin/org/metaborg/gradle/Developer.kt b/convention-plugin/src/main/kotlin/org/metaborg/gradle/Developer.kt
deleted file mode 100644
index 962a2aa..0000000
--- a/convention-plugin/src/main/kotlin/org/metaborg/gradle/Developer.kt
+++ /dev/null
@@ -1,11 +0,0 @@
-package org.metaborg.gradle
-
-/** Specifies a developer. */
-data class Developer(
-    /** The developer's ID or username. */
-    val id: String,
-    /** The developer's full name. */
-    val name: String,
-    /** The developer's email address. */
-    val email: String,
-)
diff --git a/convention-plugin/src/main/kotlin/org/metaborg/gradle/MavenPublishConventionExtension.kt b/convention-plugin/src/main/kotlin/org/metaborg/gradle/MavenPublishConventionExtension.kt
deleted file mode 100644
index 385fcb0..0000000
--- a/convention-plugin/src/main/kotlin/org/metaborg/gradle/MavenPublishConventionExtension.kt
+++ /dev/null
@@ -1,45 +0,0 @@
-package org.metaborg.gradle
-
-import org.gradle.api.provider.ListProperty
-import org.gradle.api.provider.Property
-import org.gradle.jvm.toolchain.JavaLanguageVersion
-
-/** Configuration for the Maven Publish convention. */
-interface MavenPublishConventionExtension {
-    /** The owner of the repository. */
-    val repoOwner: Property<String>
-    /** The name of the repository. */
-    val repoName: Property<String>
-    /** The year the project was started. */
-    val inceptionYear: Property<String>
-    /** The developers of the project. */
-    val developers: ListProperty<Developer>
-    /** The source control management system. */
-    val scm: Property<SCM>
-    /** The open source license that the project is published under. */
-    val license: Property<OpenSourceLicense>
-    /** Whether to publish to GitHub packages. */
-    val publishToGitHubPackages: Property<Boolean>
-    /** Whether to publish to Metaborg Artifacts. */
-    val publishToMetaborgArtifacts: Property<Boolean>
-    /** Whether to sign the artifacts. */
-    val sign: Property<Boolean>
-    /** The HTTP SCM URL format. */
-    val httpUrlFormat: Property<String>
-    /** The SCM URL format. */
-    val scmUrlFormat: Property<String>
-
-
-    /**
-     * Sets the convention (default values) for the configuration extension.
-     */
-    fun setConvention() {
-        scm.convention(SCM.GitHub)
-        license.convention(OpenSourceLicense.Apache2)
-        publishToGitHubPackages.convention(scm.map { it == SCM.GitHub })
-        publishToMetaborgArtifacts.convention(true)
-        sign.convention(false)  // Not yet supported
-        httpUrlFormat.convention(scm.map { it.httpUrlFormat })
-        scmUrlFormat.convention(scm.map { it.scmUrlFormat })
-    }
-}
\ No newline at end of file
diff --git a/convention-plugin/src/main/kotlin/org/metaborg/gradle/OpenSourceLicense.kt b/convention-plugin/src/main/kotlin/org/metaborg/gradle/OpenSourceLicense.kt
deleted file mode 100644
index e003f16..0000000
--- a/convention-plugin/src/main/kotlin/org/metaborg/gradle/OpenSourceLicense.kt
+++ /dev/null
@@ -1,14 +0,0 @@
-package org.metaborg.gradle
-
-/** Specifies the open source license. */
-enum class OpenSourceLicense(
-    /** The unique identifier of the license. */
-    val id: String,
-    /** The license URL. */
-    val url: String,
-) {
-    // From: https://spdx.org/licenses/
-
-    /** Apache 2 */
-    Apache2("Apache-2.0", "https://www.apache.org/licenses/LICENSE-2.0.txt"),
-}
\ No newline at end of file
diff --git a/convention-plugin/src/main/kotlin/org/metaborg/gradle/SCM.kt b/convention-plugin/src/main/kotlin/org/metaborg/gradle/SCM.kt
deleted file mode 100644
index 35c9435..0000000
--- a/convention-plugin/src/main/kotlin/org/metaborg/gradle/SCM.kt
+++ /dev/null
@@ -1,12 +0,0 @@
-package org.metaborg.gradle
-
-/** Specifies a source control management system. */
-enum class SCM(
-    /** The HTTP URL for the SCM. */
-    val httpUrlFormat: String,
-    /** The SCM URL for the SCM. */
-    val scmUrlFormat: String,
-) {
-    /** GitHub */
-    GitHub("https://github.com/%s/%s", "scm:git@github.com:%s/%s.git"),
-}
\ No newline at end of file