diff --git a/librarymanagement/src/main/datatype/librarymanagement.json b/librarymanagement/src/main/datatype/librarymanagement.json
index 102b22748..46fbbe0b5 100644
--- a/librarymanagement/src/main/datatype/librarymanagement.json
+++ b/librarymanagement/src/main/datatype/librarymanagement.json
@@ -27,7 +27,7 @@
         "Provides information about the resolution of a module.",
         "This information is in the context of a specific configuration."
       ],
-      "parents": "sbt.librarymanagement.ModuleReportParent",
+      "parents": "sbt.librarymanagement.ModuleReportExtra",
       "fields": [
         { "name": "module",           "type": "sbt.librarymanagement.ModuleID"                                                     },
         { "name": "artifacts",        "type": "scala.Tuple2[sbt.librarymanagement.Artifact, java.io.File]*"                        },
@@ -343,7 +343,7 @@
       "target": "Scala",
       "type": "record",
       "doc": "Represents an Ivy configuration.",
-      "parents": "sbt.librarymanagement.ConfigurationParent",
+      "parents": "sbt.librarymanagement.ConfigurationExtra",
       "fields": [
         { "name": "name",           "type": "String"                                                                            },
         { "name": "description",    "type": "String",                               "default": "\"\"",         "since": "0.0.1" },
@@ -358,7 +358,7 @@
       "namespace": "sbt.librarymanagement",
       "target": "Scala",
       "type": "record",
-      "parents": "sbt.librarymanagement.ArtifactParent",
+      "parents": "sbt.librarymanagement.ArtifactExtra",
       "fields": [
         { "name": "name",            "type": "String"                                                                                         },
         { "name": "type",            "type": "String",                               "default": "Artifact.DefaultType",      "since": "0.0.1" },
@@ -672,7 +672,7 @@
       "namespace": "sbt.librarymanagement",
       "target": "Scala",
       "type": "record",
-      "parents": "sbt.librarymanagement.ModuleIDParent",
+      "parents": "sbt.librarymanagement.ModuleIDExtra",
       "fields": [
         { "name": "organization",      "type": "String"                                                                                               },
         { "name": "name",              "type": "String"                                                                                               },
@@ -701,7 +701,7 @@
       "target": "Scala",
       "type": "record",
       "doc": "Work around the inadequacy of Ivy's ArtifactTypeFilter (that it cannot reverse a filter)",
-      "parents": "sbt.librarymanagement.ArtifactTypeFilterParent",
+      "parents": "sbt.librarymanagement.ArtifactTypeFilterExtra",
       "fields": [
         {
           "name": "types",
@@ -730,7 +730,7 @@
         "It does not include information about evicted modules, only about the modules ultimately selected by the conflict manager.",
         "This means that for a given configuration, there should only be one revision for a given organization and module name."
       ],
-      "parents": "sbt.librarymanagement.UpdateReportParent",
+      "parents": "sbt.librarymanagement.UpdateReportExtra",
       "fields": [
         {
           "name": "cachedDescriptor",
@@ -759,7 +759,7 @@
       "doc": [
         "Provides information about resolution of a single configuration."
       ],
-      "parents": "sbt.librarymanagement.ConfigurationReportParent",
+      "parents": "sbt.librarymanagement.ConfigurationReportExtra",
       "fields": [
         { "name": "configuration", "type": "String", "doc": [ "the configuration this report is for." ] },
         {
diff --git a/librarymanagement/src/main/scala/sbt/librarymanagement/Artifact.scala b/librarymanagement/src/main/scala/sbt/librarymanagement/Artifact.scala
index 7b843546a..590d686c8 100644
--- a/librarymanagement/src/main/scala/sbt/librarymanagement/Artifact.scala
+++ b/librarymanagement/src/main/scala/sbt/librarymanagement/Artifact.scala
@@ -6,7 +6,7 @@ package sbt.librarymanagement
 import java.io.File
 import java.net.URL
 
-abstract class ArtifactParent {
+abstract class ArtifactExtra {
   def name: String
   def `type`: String
   def extension: String
diff --git a/librarymanagement/src/main/scala/sbt/librarymanagement/Configuration.scala b/librarymanagement/src/main/scala/sbt/librarymanagement/Configuration.scala
index ad064f550..f0d0fff7f 100644
--- a/librarymanagement/src/main/scala/sbt/librarymanagement/Configuration.scala
+++ b/librarymanagement/src/main/scala/sbt/librarymanagement/Configuration.scala
@@ -49,7 +49,7 @@ object Configurations {
   private[sbt] def removeDuplicates(configs: Iterable[Configuration]) = Set(scala.collection.mutable.Map(configs.map(config => (config.name, config)).toSeq: _*).values.toList: _*)
 }
 
-abstract class ConfigurationParent {
+abstract class ConfigurationExtra {
   def name: String
   def description: String
   def isPublic: Boolean
diff --git a/librarymanagement/src/main/scala/sbt/librarymanagement/IvyInterface.scala b/librarymanagement/src/main/scala/sbt/librarymanagement/IvyInterface.scala
index 275856dcd..538dd0b80 100644
--- a/librarymanagement/src/main/scala/sbt/librarymanagement/IvyInterface.scala
+++ b/librarymanagement/src/main/scala/sbt/librarymanagement/IvyInterface.scala
@@ -10,7 +10,7 @@ abstract class InclExclRuleCompanion {
   def everything = new InclExclRule("*", "*", "*", Vector.empty)
 }
 
-abstract class ArtifactTypeFilterParent {
+abstract class ArtifactTypeFilterExtra {
   def types: Set[String]
   def inverted: Boolean
 
diff --git a/librarymanagement/src/main/scala/sbt/librarymanagement/ModuleID.scala b/librarymanagement/src/main/scala/sbt/librarymanagement/ModuleID.scala
index 3716ac790..2f802017e 100644
--- a/librarymanagement/src/main/scala/sbt/librarymanagement/ModuleID.scala
+++ b/librarymanagement/src/main/scala/sbt/librarymanagement/ModuleID.scala
@@ -7,7 +7,7 @@ import java.net.URL
 
 import sbt.internal.librarymanagement.mavenint.SbtPomExtraProperties
 
-abstract class ModuleIDParent {
+abstract class ModuleIDExtra {
   def organization: String
   def name: String
   def revision: String
diff --git a/librarymanagement/src/main/scala/sbt/librarymanagement/UpdateReport.scala b/librarymanagement/src/main/scala/sbt/librarymanagement/UpdateReport.scala
index fb0b0a87b..ecc81493b 100644
--- a/librarymanagement/src/main/scala/sbt/librarymanagement/UpdateReport.scala
+++ b/librarymanagement/src/main/scala/sbt/librarymanagement/UpdateReport.scala
@@ -6,7 +6,7 @@ package sbt.librarymanagement
 import java.io.File
 import java.{ util => ju }
 
-abstract class ConfigurationReportParent {
+abstract class ConfigurationReportExtra {
   def configuration: String
   def modules: Vector[ModuleReport]
   def details: Vector[OrganizationArtifactReport]
@@ -36,7 +36,7 @@ abstract class ConfigurationReportParent {
     new ConfigurationReport(configuration, modules map { _.retrieve((mid, art, file) => f(configuration, mid, art, file)) }, details)
 }
 
-abstract class ModuleReportParent {
+abstract class ModuleReportExtra {
   def module: ModuleID
   def artifacts: Vector[(Artifact, File)]
   def missingArtifacts: Vector[Artifact]
@@ -120,7 +120,7 @@ abstract class ModuleReportParent {
   ): ModuleReport
 }
 
-abstract class UpdateReportParent {
+abstract class UpdateReportExtra {
   def cachedDescriptor: File
   def configurations: Vector[ConfigurationReport]
   def stats: UpdateStats