diff --git a/example/net/poettering/Calculator.interface.yaml b/example/net/poettering/Calculator.interface.yaml
index a942f5c..967048d 100644
--- a/example/net/poettering/Calculator.interface.yaml
+++ b/example/net/poettering/Calculator.interface.yaml
@@ -1,88 +1,88 @@
 description: >
-    An example interface originally described as part of the announcement
-    of new sd-bus interfaces at:
-        http://0pointer.net/blog/the-new-sd-bus-api-of-systemd.html
+  An example interface originally described as part of the announcement
+  of new sd-bus interfaces at:
+      http://0pointer.net/blog/the-new-sd-bus-api-of-systemd.html
 methods:
-    - name: Multiply
-      description: >
-        Multiplies two integers 'x' and 'y' and returns the result.
-      parameters:
-        - name: x
-          type: int64
-          description: >
-            The first integer to multiply.
-        - name: y
-          type: int64
-          description: >
-            The second integer to multiply.
-          default: 1
-      returns:
-        - name: z
-          type: int64
-          description: >
-            The result of (x*y).
-    - name: Divide
-      description: >
-        Divides two integers 'x' and 'y' and returns the result.
-      parameters:
-        - name: x
-          type: int64
-          description: >
-            The first integer to divide.
-        - name: y
-          type: int64
-          description: >
-            The second integer to divide.
-          default: 1
-      returns:
-        - name: z
-          type: int64
-          description: >
-            The result of (x/y).
-      errors:
-        - self.Error.DivisionByZero
-    - name: Clear
-      flags:
-        - unprivileged
-        - no_reply
-      description: >
-        Reset the LastResult property to zero.
+  - name: Multiply
+    description: >
+      Multiplies two integers 'x' and 'y' and returns the result.
+    parameters:
+      - name: x
+        type: int64
+        description: >
+          The first integer to multiply.
+      - name: y
+        type: int64
+        description: >
+          The second integer to multiply.
+        default: 1
+    returns:
+      - name: z
+        type: int64
+        description: >
+          The result of (x*y).
+  - name: Divide
+    description: >
+      Divides two integers 'x' and 'y' and returns the result.
+    parameters:
+      - name: x
+        type: int64
+        description: >
+          The first integer to divide.
+      - name: y
+        type: int64
+        description: >
+          The second integer to divide.
+        default: 1
+    returns:
+      - name: z
+        type: int64
+        description: >
+          The result of (x/y).
+    errors:
+      - self.Error.DivisionByZero
+  - name: Clear
+    flags:
+      - unprivileged
+      - no_reply
+    description: >
+      Reset the LastResult property to zero.
 properties:
-    - name: LastResult
-      type: int64
-      default: 0
-      description: >
-        The result of the most recent calculation.
-    - name: Status
-      type: enum[self.State]
-      default: Success
-      flags:
-        - const
-      description: >
-        The current state of the Calculator.
-    - name: Owner
-      type: string
-      description: >
-        The name of the owner of the Calculator.
-      errors:
-        - self.Error.PermissionDenied
+  - name: LastResult
+    type: int64
+    default: 0
+    description: >
+      The result of the most recent calculation.
+  - name: Status
+    type: enum[self.State]
+    default: Success
+    flags:
+      - const
+    description: >
+      The current state of the Calculator.
+  - name: Owner
+    type: string
+    description: >
+      The name of the owner of the Calculator.
+    errors:
+      - self.Error.PermissionDenied
 signals:
-    - name: Cleared
-      description: >
-        Signal indicating the LastReset property has been set to zero by the
-        'Clear' method.
-      properties:
-        - type: int64
-          description: >
-            Value of LastReset prior to Clear.
+  - name: Cleared
+    description: >
+      Signal indicating the LastReset property has been set to zero by the
+      'Clear' method.
+    properties:
+      - type: int64
+        description: >
+          Value of LastReset prior to Clear.
 enumerations:
-    - name: State
-      description: >
-        Identifies if the service has encountered an error or not.
-      values:
-        - name: Success
-          description: >
-            No error has been encountered.
-        - name: Error
-          description: >
-            The service has encountered an error.
+  - name: State
+    description: >
+      Identifies if the service has encountered an error or not.
+    values:
+      - name: Success
+        description: >
+          No error has been encountered.
+      - name: Error
+        description: >
+          The service has encountered an error.
diff --git a/test/server/Test.interface.yaml b/test/server/Test.interface.yaml
index 18c3450..4f79ebd 100644
--- a/test/server/Test.interface.yaml
+++ b/test/server/Test.interface.yaml
@@ -1,49 +1,49 @@
 description: >
-    A test interface
+  A test interface
 properties:
-    - name: SomeValue
-      type: int64
-    - name: ReadonlyValue
-      type: int64
-      flags:
-          - readonly
-          - emits_change
-    - name: ConstValue
-      type: int64
-      flags:
-          - const
-    - name: Countable
-      type: size
-    - name: SignedCountable
-      type: ssize
-    - name: UnsignedInt32
-      type: uint32
-    - name: UnsignedInt64
-      type: uint64
-    - name: ObjectPath
-      type: object_path
-    - name: DoubleAsNAN
-      type: double
-      default: NaN
-    - name: DoubleAsInf
-      type: double
-      default: Infinity
-    - name: DoubleAsNegInf
-      type: double
-      default: -Infinity
-    - name: DoubleAsEpsilon
-      type: double
-      default: Epsilon
+  - name: SomeValue
+    type: int64
+  - name: ReadonlyValue
+    type: int64
+    flags:
+      - readonly
+      - emits_change
+  - name: ConstValue
+    type: int64
+    flags:
+      - const
+  - name: Countable
+    type: size
+  - name: SignedCountable
+    type: ssize
+  - name: UnsignedInt32
+    type: uint32
+  - name: UnsignedInt64
+    type: uint64
+  - name: ObjectPath
+    type: object_path
+  - name: DoubleAsNAN
+    type: double
+    default: NaN
+  - name: DoubleAsInf
+    type: double
+    default: Infinity
+  - name: DoubleAsNegInf
+    type: double
+    default: -Infinity
+  - name: DoubleAsEpsilon
+    type: double
+    default: Epsilon
 
-    - name: VariantOfEnums
-      type: variant[enum[self.EnumOne], string, enum[self.EnumTwo]]
+  - name: VariantOfEnums
+    type: variant[enum[self.EnumOne], string, enum[self.EnumTwo]]
 
 enumerations:
-    - name: EnumOne
-      values:
-        - name: OneA
-        - name: OneB
-    - name: EnumTwo
-      values:
-        - name: TwoA
-        - name: TwoB
+  - name: EnumOne
+    values:
+      - name: OneA
+      - name: OneB
+  - name: EnumTwo
+    values:
+      - name: TwoA
+      - name: TwoB