mps-ui-language/META-INF/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<idea-plugin version="2">
  <id>jetbrains.mps.uiLanguage</id>
  <name>MPS UI Language</name>
  <version>3.0</version>
  <vendor url="http://www.jetbrains.com/mps/">JetBrains</vendor>
  <depends>jetbrains.mps.core</depends>
  <extensions defaultExtensionNs="com.intellij">
    <mps.LanguageLibrary dir="/languages" />
    <mps.LanguageLibrary dir="/lib" />
  </extensions>
</idea-plugin>