diff --git a/buildSrc/src/main/kotlin/kotlinx/html/generate/attributes.kt b/buildSrc/src/main/kotlin/kotlinx/html/generate/attributes.kt
index 48e42873..07ab8462 100644
--- a/buildSrc/src/main/kotlin/kotlinx/html/generate/attributes.kt
+++ b/buildSrc/src/main/kotlin/kotlinx/html/generate/attributes.kt
@@ -14,9 +14,14 @@ fun Appendable.attributePseudoDelegate(request: AttributeRequest) {
     emptyLine()
 }
 
-fun Appendable.attributeProperty(attribute: AttributeInfo, receiver: String? = null, indent: Int = 1) {
+fun Appendable.attributeProperty(
+    repository: Repository,
+    attribute: AttributeInfo,
+    receiver: String? = null,
+    indent: Int = 1
+) {
     val attributeName = attribute.name
-    val request = tagAttributeVar(attribute, receiver, indent)
+    val request = tagAttributeVar(repository, attribute, receiver, indent)
     append("\n")
 
     indent(indent)
@@ -34,7 +39,7 @@ fun Appendable.attributeProperty(attribute: AttributeInfo, receiver: String? = n
     emptyLine()
 }
 
-fun Appendable.facade(facade: AttributeFacade) {
+fun Appendable.facade(repository: Repository, facade: AttributeFacade) {
     val facadeName = facade.name.capitalize() + "Facade"
 
     clazz(Clazz(facadeName, isInterface = true, parents = listOf("Tag"))) {
@@ -42,7 +47,7 @@ fun Appendable.facade(facade: AttributeFacade) {
 
     facade.attributes.filter { !isAttributeExcluded(it.name) }.forEach { attribute ->
         if (attribute.name.isLowerCase() || attribute.name.lowercase() !in facade.attributeNames) {
-            attributeProperty(attribute, receiver = facadeName, indent = 0)
+            attributeProperty(repository, attribute, receiver = facadeName, indent = 0)
         }
     }
 }
diff --git a/buildSrc/src/main/kotlin/kotlinx/html/generate/main.kt b/buildSrc/src/main/kotlin/kotlinx/html/generate/main.kt
index 3243f49c..bb95c635 100644
--- a/buildSrc/src/main/kotlin/kotlinx/html/generate/main.kt
+++ b/buildSrc/src/main/kotlin/kotlinx/html/generate/main.kt
@@ -3,7 +3,8 @@ package kotlinx.html.generate
 import java.io.*
 
 fun generate(packg: String, todir: String, jsdir: String) {
-    fillRepository()
+    val repository = Repository()
+    fillRepository(repository)
     fillKdocRepositoryExtension()
 
     File(todir).mkdirs()
@@ -21,14 +22,14 @@ fun generate(packg: String, todir: String, jsdir: String) {
             emptyLine()
             emptyLine()
 
-            Repository.attributeFacades.values.forEach {
-                facade(it)
+            repository.attributeFacades.values.forEach {
+                facade(repository, it)
                 emptyLine()
             }
         }
     }
 
-    Repository.tags.values.filterIgnored().groupBy { it.name[0] }.entries.forEach { e ->
+    repository.tags.values.filterIgnored().groupBy { it.name[0] }.entries.forEach { e ->
         FileOutputStream("$todir/gen-tags-${e.key}.kt").writer(Charsets.UTF_8).use {
             it.with {
                 packg(packg)
@@ -43,7 +44,7 @@ fun generate(packg: String, todir: String, jsdir: String) {
                 emptyLine()
 
                 e.value.forEach {
-                    tagClass(it, emptySet())
+                    tagClass(repository, it, emptySet())
                 }
             }
         }
@@ -62,7 +63,7 @@ fun generate(packg: String, todir: String, jsdir: String) {
             emptyLine()
             emptyLine()
 
-            Repository.tags.values.filterIgnored().forEach {
+            repository.tags.values.filterIgnored().forEach {
                 val contentlessTag = it.name.lowercase() in contentlessTags
                 if (it.possibleChildren.isEmpty() && it.name.lowercase() !in emptyTags && !contentlessTag) {
                     consumerBuilderShared(it, false)
@@ -91,7 +92,7 @@ fun generate(packg: String, todir: String, jsdir: String) {
             emptyLine()
             emptyLine()
 
-            Repository.tags.values.filterIgnored().forEach {
+            repository.tags.values.filterIgnored().forEach {
                 val contentlessTag = it.name.lowercase() in contentlessTags
                 if (it.possibleChildren.isEmpty() && it.name.lowercase() !in emptyTags && !contentlessTag) {
                     consumerBuilderJS(it, false)
@@ -118,7 +119,7 @@ fun generate(packg: String, todir: String, jsdir: String) {
             emptyLine()
             emptyLine()
 
-            Repository.attributeFacades.filter { it.value.attributeNames.any { it.startsWith("on") } }.forEach { facade ->
+            repository.attributeFacades.filter { it.value.attributeNames.any { it.startsWith("on") } }.forEach { facade ->
                 facade.value.attributes.filter { it.name.startsWith("on") }.forEach {
                     eventProperty(facade.value.name.capitalize() + "Facade", it)
                 }
@@ -147,13 +148,13 @@ fun generate(packg: String, todir: String, jsdir: String) {
                 }
             }
 
-            Repository.attributeFacades.values.forEach { facade ->
+            repository.attributeFacades.values.forEach { facade ->
                 facade.attributes.filter { it.enumValues.isNotEmpty() }.filter { !isAttributeExcluded(it.name) }.forEach { attribute ->
                     genEnumAttribute(attribute)
                 }
             }
 
-            Repository.tags.values.filterIgnored().forEach { tag ->
+            repository.tags.values.filterIgnored().forEach { tag ->
                 tag.attributes.filter { it.enumValues.isNotEmpty() }.filter { !isAttributeExcluded(it.name) }.forEach { attribute ->
                     genEnumAttribute(attribute)
                 }
@@ -173,7 +174,7 @@ fun generate(packg: String, todir: String, jsdir: String) {
             emptyLine()
             emptyLine()
 
-            Repository.attributeDelegateRequests.toList().forEach {
+            repository.attributeDelegateRequests.toList().forEach {
                 attributePseudoDelegate(it)
             }
         }
@@ -192,7 +193,7 @@ fun generate(packg: String, todir: String, jsdir: String) {
             emptyLine()
             emptyLine()
 
-            Repository.groupUnions.values.forEach { union ->
+            repository.groupUnions.values.forEach { union ->
                 clazz(Clazz(
                         name = union.name,
                         isInterface = true,
@@ -205,8 +206,8 @@ fun generate(packg: String, todir: String, jsdir: String) {
             emptyLine()
             emptyLine()
 
-            Repository.groupUnions.values.forEach { union ->
-                (union.additionalTags + union.ambiguityTags).mapNotNull { Repository.tags[it] }.filterIgnored().forEach { tag ->
+            repository.groupUnions.values.forEach { union ->
+                (union.additionalTags + union.ambiguityTags).mapNotNull { repository.tags[it] }.filterIgnored().forEach { tag ->
                     htmlTagBuilders(union.name, tag)
                 }
 
@@ -228,19 +229,19 @@ fun generate(packg: String, todir: String, jsdir: String) {
             emptyLine()
             emptyLine()
 
-            Repository.tagGroups.values.forEach { group ->
-                val unions = Repository.unionsByGroups[group.name].orEmpty().map { it.name }
+            repository.tagGroups.values.forEach { group ->
+                val unions = repository.unionsByGroups[group.name].orEmpty().map { it.name }
 
                 clazz(Clazz(name = group.typeName, parents = unions + "Tag", isPublic = true, isInterface = true)) {
                 }
                 emptyLine()
             }
 
-            Repository.tagGroups.values.forEach { group ->
+            repository.tagGroups.values.forEach { group ->
                 val receiver = group.typeName
-                val unions = Repository.unionsByGroups[group.name].orEmpty()
+                val unions = repository.unionsByGroups[group.name].orEmpty()
 
-                group.tags.mapNotNull { Repository.tags[it] }.filterIgnored().filter { tag -> unions.count { tag.name in it.intersectionTags } == 0 }.forEach {
+                group.tags.mapNotNull { repository.tags[it] }.filterIgnored().filter { tag -> unions.count { tag.name in it.intersectionTags } == 0 }.forEach {
                     htmlTagBuilders(receiver, it)
                 }
             }
@@ -290,5 +291,5 @@ fun generate(packg: String, todir: String, jsdir: String) {
         }
     }
 
-    generateParentInterfaces(todir, packg)
+    generateParentInterfaces(repository, todir, packg)
 }
diff --git a/buildSrc/src/main/kotlin/kotlinx/html/generate/model.kt b/buildSrc/src/main/kotlin/kotlinx/html/generate/model.kt
index f240c81e..11c17529 100644
--- a/buildSrc/src/main/kotlin/kotlinx/html/generate/model.kt
+++ b/buildSrc/src/main/kotlin/kotlinx/html/generate/model.kt
@@ -3,7 +3,7 @@ package kotlinx.html.generate
 import java.util.*
 import kotlin.collections.HashMap
 
-object Repository {
+class Repository {
     val tags = TreeMap<String, TagInfo>()
 
     val attributeDelegateRequests = TreeSet<AttributeRequest> (
diff --git a/buildSrc/src/main/kotlin/kotlinx/html/generate/parent-ifaces-gen.kt b/buildSrc/src/main/kotlin/kotlinx/html/generate/parent-ifaces-gen.kt
index be361d11..d50d9b9a 100644
--- a/buildSrc/src/main/kotlin/kotlinx/html/generate/parent-ifaces-gen.kt
+++ b/buildSrc/src/main/kotlin/kotlinx/html/generate/parent-ifaces-gen.kt
@@ -3,8 +3,8 @@ package kotlinx.html.generate
 import java.io.*
 import java.util.*
 
-fun generateParentInterfaces(todir: String, packg: String) {
-    val allParentIfaces = Repository.tags.values.filterIgnored().map { tag ->
+fun generateParentInterfaces(repository: Repository, todir: String, packg: String) {
+    val allParentIfaces = repository.tags.values.filterIgnored().map { tag ->
         val parentAttributeIfaces = tag.attributeGroups.map { it.name.humanize().capitalize() + "Facade" }
         val parentElementIfaces = tag.tagGroupNames.map { it.humanize().capitalize() }
         val sum = parentAttributeIfaces + parentElementIfaces
diff --git a/buildSrc/src/main/kotlin/kotlinx/html/generate/tag-unions.kt b/buildSrc/src/main/kotlin/kotlinx/html/generate/tag-unions.kt
index 9dc29273..82519433 100644
--- a/buildSrc/src/main/kotlin/kotlinx/html/generate/tag-unions.kt
+++ b/buildSrc/src/main/kotlin/kotlinx/html/generate/tag-unions.kt
@@ -1,16 +1,16 @@
 package kotlinx.html.generate
 
-fun tagUnions() {
-    val groupings = Repository.groupsByTags.filter { it.value.size > 1 }
+fun tagUnions(repository: Repository) {
+    val groupings = repository.groupsByTags.filter { it.value.size > 1 }
     val groups = groupings.values.map { it.map { it.name }.toHashSet() }.distinct().sortedByDescending { it.size }
-    val allUnions = Repository.groupUnions
+    val allUnions = repository.groupUnions
 
     // initial pass
     groups.forEach { group ->
         val name = unionName(group)
         val superGroups = groups.filter { it !== group && it.containsAll(group) }
         val members = group.toList()
-        val intersection = members.map { Repository.tagGroups[it]!!.tags.toSet() }.reduce { a, b -> a.intersect(b) }
+        val intersection = members.map { repository.tagGroups[it]!!.tags.toSet() }.reduce { a, b -> a.intersect(b) }
 
         val union = GroupUnion(members, intersection, emptyList(), emptyList(), superGroups.map(::unionName))
         require(union.name == name)
@@ -31,7 +31,7 @@ fun tagUnions() {
 
     // transpose map
     val unionsByGroups = allUnions.values.flatMap { u -> u.members.map { it to u.name } }.groupBy({ it.first }, { allUnions[it.second]!! })
-    Repository.unionsByGroups = unionsByGroups
+    repository.unionsByGroups = unionsByGroups
 }
 
 fun unionName(members: Iterable<String>) = humanizeJoin(members, "Or")
diff --git a/buildSrc/src/main/kotlin/kotlinx/html/generate/tagsgen.kt b/buildSrc/src/main/kotlin/kotlinx/html/generate/tagsgen.kt
index 1bdca4a1..b87f88e6 100644
--- a/buildSrc/src/main/kotlin/kotlinx/html/generate/tagsgen.kt
+++ b/buildSrc/src/main/kotlin/kotlinx/html/generate/tagsgen.kt
@@ -2,7 +2,7 @@ package kotlinx.html.generate
 
 import java.util.*
 
-fun Appendable.tagClass(tag : TagInfo, excludeAttributes : Set<String>) {
+fun Appendable.tagClass(repository: Repository, tag: TagInfo, excludeAttributes : Set<String>) {
     val parentAttributeIfaces = tag.attributeGroups.map {it.name.capitalize() + "Facade"}
     val parentElementIfaces = tag.tagGroupNames.map { it.humanize().capitalize() }
     val allParentIfaces = parentAttributeIfaces + parentElementIfaces
@@ -48,7 +48,7 @@ fun Appendable.tagClass(tag : TagInfo, excludeAttributes : Set<String>) {
 
         attributes.filter {!isAttributeExcluded(it.name) }.forEach { attribute ->
             if (attribute.name[0].isLowerCase() || attribute.name.lowercase() !in lowerCasedNames) {
-                attributeProperty(attribute)
+                attributeProperty(repository, attribute)
             }
         }
 
@@ -126,12 +126,12 @@ fun Appendable.tagClass(tag : TagInfo, excludeAttributes : Set<String>) {
         emptyLine()
     }
 
-    tag.directChildren.map {Repository.tags[it]}.filterNotNull().filterIgnored().forEach { children ->
+    tag.directChildren.map {repository.tags[it]}.filterNotNull().filterIgnored().forEach { children ->
         htmlTagBuilders(tag.className, children)
     }
 
     if (parentElementIfaces.size > 1) {
-        val commons = tag.tagGroupNames.map {Repository.tagGroups[it]?.tags?.toSet()}.filterNotNull().reduce { a, b -> a.intersect(b) }
+        val commons = tag.tagGroupNames.map {repository.tagGroups[it]?.tags?.toSet()}.filterNotNull().reduce { a, b -> a.intersect(b) }
         if (commons.isNotEmpty()) {
             parentElementIfaces.forEach { group ->
                 variable(Var(name = "as" + group, type = group), receiver = tag.className)
@@ -146,7 +146,12 @@ fun Appendable.tagClass(tag : TagInfo, excludeAttributes : Set<String>) {
     emptyLine()
 }
 
-internal fun Appendable.tagAttributeVar(attribute: AttributeInfo, receiver: String?, indent: Int = 1): AttributeRequest {
+internal fun Appendable.tagAttributeVar(
+    repository: Repository,
+    attribute: AttributeInfo,
+    receiver: String?,
+    indent: Int = 1
+): AttributeRequest {
     val options = LinkedList<Const<*>>()
 
     if (attribute.type == AttributeType.ENUM) {
@@ -156,7 +161,7 @@ internal fun Appendable.tagAttributeVar(attribute: AttributeInfo, receiver: Stri
     }
 
     val attributeRequest = AttributeRequest(attribute.type, if (attribute.type == AttributeType.ENUM) attribute.enumTypeName else "", options)
-    Repository.attributeDelegateRequests.add(attributeRequest)
+    repository.attributeDelegateRequests.add(attributeRequest)
 
     indent(indent)
     variable(Var(attribute.fieldName, attribute.typeName, true), receiver = receiver ?: "")
diff --git a/buildSrc/src/main/kotlin/kotlinx/html/generate/xsdparser.kt b/buildSrc/src/main/kotlin/kotlinx/html/generate/xsdparser.kt
index 0f3e1fb3..c4e3544c 100644
--- a/buildSrc/src/main/kotlin/kotlinx/html/generate/xsdparser.kt
+++ b/buildSrc/src/main/kotlin/kotlinx/html/generate/xsdparser.kt
@@ -44,15 +44,15 @@ fun handleAttributeDeclaration(prefix: String, attributeDeclaration: XSAttribute
                 .filter { it.name == "enumeration" }
                 .map { it.value.value }
 
-        if (enumEntries.size == 1 && enumEntries.single() == name) {
+        return if (enumEntries.size == 1 && enumEntries.single() == name) {
             // probably ticker
-            return AttributeInfo(name, AttributeType.TICKER)
+            AttributeInfo(name, AttributeType.TICKER)
         } else if (enumEntries.size == 2 && enumEntries.sorted() == listOf("off", "on")) {
-            return AttributeInfo(name, AttributeType.BOOLEAN, trueFalse = listOf("on", "off"))
+            AttributeInfo(name, AttributeType.BOOLEAN, trueFalse = listOf("on", "off"))
         } else if (enumEntries.isEmpty()) {
-            return AttributeInfo(name, AttributeType.STRING)
+            AttributeInfo(name, AttributeType.STRING)
         } else {
-            return AttributeInfo(name, AttributeType.ENUM, enumValues = enumEntries.toAttributeValues(), enumTypeName = prefix.capitalize() + name.humanize().capitalize())
+            AttributeInfo(name, AttributeType.ENUM, enumValues = enumEntries.toAttributeValues(), enumTypeName = prefix.capitalize() + name.humanize().capitalize())
         }
     } else {
         return AttributeInfo(name, AttributeType.STRING)
@@ -72,13 +72,12 @@ fun AttributeInfo.handleSpecialType(tagName: String = ""): AttributeInfo = speci
     this.copy(type = type)
 } ?: this
 
-fun fillRepository() {
+fun fillRepository(repository: Repository) {
     val parser = XSOMParser(SAXParserFactory.newInstance())
     parser.parse(SCHEME_URL)
     val schema = parser.result.getSchema(HTML_NAMESPACE)
 
-    @Suppress("UNCHECKED_CAST")
-    val alreadyIncluded = TreeSet<String>() { a, b -> a.compareTo(b, true) }
+    val alreadyIncluded = TreeSet<String> { a, b -> a.compareTo(b, true) }
     schema.attGroupDecls.values.sortedByDescending { it.attributeUses.size }.forEach { attributeGroup ->
         val requiredNames = HashSet<String>()
         val facadeAttributes = attributeGroup.attributeUses.map { attributeUse ->
@@ -95,7 +94,7 @@ fun fillRepository() {
         val name = attributeGroup.name
 
         if (facadeAttributes.isNotEmpty()) {
-            Repository.attributeFacades[name] = AttributeFacade(name, facadeAttributes, requiredNames)
+            repository.attributeFacades[name] = AttributeFacade(name, facadeAttributes, requiredNames)
             alreadyIncluded.addAll(facadeAttributes.map { it.name })
         }
     }
@@ -109,9 +108,9 @@ fun fillRepository() {
                 .map { it.asElementDecl().name }
 
         val group = TagGroup(name, children)
-        Repository.tagGroups[name] = group
+        repository.tagGroups[name] = group
         children.forEach {
-            Repository.groupsByTags.getOrPut(it) { ArrayList<TagGroup>() }.add(group)
+            repository.groupsByTags.getOrPut(it) { ArrayList<TagGroup>() }.add(group)
         }
     }
 
@@ -128,7 +127,7 @@ fun fillRepository() {
         if (type.isComplexType) {
             val complex = type.asComplexType()
             val groupDeclarations = complex.attGroups.flatMap { flattenGroups(it) }.distinct().toList()
-            val attributeGroups = groupDeclarations.map { Repository.attributeFacades[it.name] }.filterNotNull()
+            val attributeGroups = groupDeclarations.map { repository.attributeFacades[it.name] }.filterNotNull()
 
             val attributes = complex.declaredAttributeUses.map {
                 if (it.isRequired) {
@@ -149,7 +148,7 @@ fun fillRepository() {
                 }
             }
 
-            modelGroupNames.addAll(Repository.groupsByTags[name]?.map { it.name }.orEmpty())
+            modelGroupNames.addAll(repository.groupsByTags[name]?.map { it.name }.orEmpty())
 
             suggestedNames.addAll(attributes.filter { it.type == AttributeType.ENUM }.map { it.name })
             suggestedNames.addAll(attributes.filter { it.name in globalSuggestedAttributeNames }.map { it.name })
@@ -161,10 +160,10 @@ fun fillRepository() {
             throw UnsupportedOperationException()
         }
 
-        Repository.tags[name] = tagInfo
+        repository.tags[name] = tagInfo
     }
 
-    tagUnions()
+    tagUnions(repository)
 }
 
 private val xsdToType = mapOf(