String pluginId = declaration.getId();
        MavenPublicationInternal publication = (MavenPublicationInternal) publications.create(declaration.getName() + "PluginMarkerMaven", MavenPublication.class);
        publication.setAlias(true);
        publication.setArtifactId(pluginId + PLUGIN_MARKER_SUFFIX);
        publication.setGroupId(pluginId);

* multiple <<plugins.adoc#sec:plugin_markers,"marker" publications>> (one for each plugin defined in the `gradlePlugin {}` block), named `<pluginName>PluginMarkerMaven` (for example in the above example it would be `simplePluginPluginMarkerMaven`)