ident_size 2 is better for XML readability :)

.editorconfig

@@ -22,7 +22,7 @@ indent_size = 2
 
 [*.xml]
 indent_style = space
-indent_size = 4
+indent_size = 2
 
 [*.json]
 indent_style = space

docblox.dist.xml

@@ -1,13 +1,12 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <docblox>
-    <parser>
-        <target>data/output</target>
-    </parser>
-    <transformer>
-        <target>data/output</target>
-    </transformer>
-    <files>
-        <directory>.</directory>
-    </files>
+  <parser>
+    <target>data/output</target>
+  </parser>
+  <transformer>
+    <target>data/output</target>
+  </transformer>
+  <files>
+    <directory>.</directory>
+  </files>
 </docblox>
-

ruleset.xml

@@ -1,15 +1,15 @@
 <?xml version="1.0"?>
 <ruleset name="Friendica">
-    <description>Friendica Coding Standards: PSR2 with tabs instead of spaces</description>
-    <arg name="tab-width" value="4"/>
-    <rule ref="PSR2">
-        <exclude name="Generic.WhiteSpace.DisallowTabIndent"/>
-    </rule>
-    <rule ref="Generic.WhiteSpace.DisallowSpaceIndent"/>
-    <rule ref="Generic.WhiteSpace.ScopeIndent">
-        <properties>
-            <property name="indent" value="4"/>
-            <property name="tabIndent" value="true"/>
-        </properties>
-    </rule>
+  <description>Friendica Coding Standards: PSR2 with tabs instead of spaces</description>
+  <arg name="tab-width" value="4"/>
+  <rule ref="PSR2">
+    <exclude name="Generic.WhiteSpace.DisallowTabIndent"/>
+  </rule>
+  <rule ref="Generic.WhiteSpace.DisallowSpaceIndent"/>
+  <rule ref="Generic.WhiteSpace.ScopeIndent">
+    <properties>
+      <property name="indent" value="4"/>
+      <property name="tabIndent" value="true"/>
+    </properties>
+  </rule>
 </ruleset>