diff --git a/build.gradle.kts b/build.gradle.kts
index 1bbfe167..1cd8b00e 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -46,17 +46,19 @@ allprojects {
 
     group = "hep.dataforge"
     version = "0.1.2-dev-5"
-
-    // apply bintray configuration
-    apply(from = "${rootProject.rootDir}/gradle/bintray.gradle")
-
-    //apply artifactory configuration
-    apply(from = "${rootProject.rootDir}/gradle/artifactory.gradle")
-
 }
 
 subprojects {
 
+    if(name.startsWith("dataforge")){
+        // apply bintray configuration
+        apply(from = "${rootProject.rootDir}/gradle/bintray.gradle")
+
+        //apply artifactory configuration
+        apply(from = "${rootProject.rootDir}/gradle/artifactory.gradle")
+
+    }
+
     //    dokka {
 //        outputFormat = "html"
 //        outputDirectory = javadoc.destinationDir
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/ConfigDelegates.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/ConfigDelegates.kt
index 9a5f15cb..3f39b8bf 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/ConfigDelegates.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/ConfigDelegates.kt
@@ -22,9 +22,23 @@ fun Configurable.boolean(default: Boolean? = null, key: String? = null) =
 fun Configurable.number(default: Number? = null, key: String? = null) =
     MutableNumberDelegate(config, key, default)
 
-fun Configurable.node(key: String? = null) = MutableNodeDelegate(config, key)
+/* Number delegates*/
+
+fun Configurable.int(default: Int? = null, key: String? = null) =
+    number(default, key).int
+
+fun Configurable.double(default: Double? = null, key: String? = null) =
+    number(default, key).double
+
+fun Configurable.long(default: Long? = null, key: String? = null) =
+    number(default, key).long
+
+fun Configurable.short(default: Short? = null, key: String? = null) =
+    number(default, key).short
+
+fun Configurable.float(default: Float? = null, key: String? = null) =
+    number(default, key).float
 
-//fun <T : Configurable> Configurable.spec(spec: Specification<T>, key: String? = null) = ChildConfigDelegate<T>(key) { spec.wrap(this) }
 
 @JvmName("safeString")
 fun Configurable.string(default: String, key: String? = null) =
@@ -51,5 +65,38 @@ fun Configurable.number(key: String? = null, default: () -> Number) =
     MutableSafeNumberDelegate(config, key, default)
 
 
+/* Safe number delegates*/
+
+@JvmName("safeInt")
+fun Configurable.int(default: Int, key: String? = null) =
+    number(default, key).int
+
+@JvmName("safeDouble")
+fun Configurable.double(default: Double, key: String? = null) =
+    number(default, key).double
+
+@JvmName("safeLong")
+fun Configurable.long(default: Long, key: String? = null) =
+    number(default, key).long
+
+@JvmName("safeShort")
+fun Configurable.short(default: Short, key: String? = null) =
+    number(default, key).short
+
+@JvmName("safeFloat")
+fun Configurable.float(default: Float, key: String? = null) =
+    number(default, key).float
+
+/**
+ * Enum delegate
+ */
 inline fun <reified E : Enum<E>> Configurable.enum(default: E, key: String? = null) =
-    MutableSafeEnumvDelegate(config, key, default) { enumValueOf(it) }
\ No newline at end of file
+    MutableSafeEnumvDelegate(config, key, default) { enumValueOf(it) }
+
+fun Configurable.node(key: String? = null) = MutableNodeDelegate(config, key)
+
+fun <T : Specification> Configurable.spec(spec: SpecificationCompanion<T>, key: String? = null) =
+    MutableMorphDelegate(config, key) { spec.wrap(it) }
+
+fun <T : Specification> Configurable.spec(builder: (Config) -> T, key: String? = null) =
+    MutableMorphDelegate(config, key) { specification(builder).wrap(it) }
\ No newline at end of file
diff --git a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Specification.kt b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Specification.kt
index 44f657de..72e6e4b6 100644
--- a/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Specification.kt
+++ b/dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Specification.kt
@@ -22,7 +22,7 @@ interface SpecificationCompanion<T : Specification> {
 
     fun build(action: T.() -> Unit) = update(Config(), action)
 
-    fun empty() = build {  }
+    fun empty() = build { }
 
     /**
      * Wrap generic configuration producing instance of desired type
@@ -59,5 +59,4 @@ fun <C : Specification, S : SpecificationCompanion<C>> S.createStyle(action: C.(
 fun <C : Specification> Specification.spec(
     spec: SpecificationCompanion<C>,
     key: String? = null
-) =
-    MutableMorphDelegate(config, key) { spec.wrap(config) }
\ No newline at end of file
+) = MutableMorphDelegate(config, key) { spec.wrap(it) }
\ No newline at end of file
diff --git a/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/MetaDelegateTest.kt b/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/MetaDelegateTest.kt
index fbd93e62..34cb43b6 100644
--- a/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/MetaDelegateTest.kt
+++ b/dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/MetaDelegateTest.kt
@@ -12,17 +12,30 @@ class MetaDelegateTest {
 
     @Test
     fun delegateTest() {
+
+        class InnerSpec(override val config: Config) : Specification {
+            var innerValue by string()
+        }
+
+        val innerSpec = specification(::InnerSpec)
+
         val testObject = object : Specification {
             override val config: Config = Config()
-            var myValue by config.string()
-            var safeValue by config.number(2.2)
+            var myValue by string()
+            var safeValue by double(2.2)
             var enumValue by config.enum(TestEnum.YES)
+            var inner by spec(innerSpec)
         }
         testObject.config["myValue"] = "theString"
         testObject.enumValue = TestEnum.NO
+
+        testObject.inner = innerSpec.build { innerValue = "ddd"}
+
         assertEquals("theString", testObject.myValue)
         assertEquals(TestEnum.NO, testObject.enumValue)
         assertEquals(2.2, testObject.safeValue)
+        assertEquals("ddd", testObject.inner?.innerValue)
+
     }
 
 }
\ No newline at end of file