diff --git a/src/gui/interact/ui-coord.hpp b/src/gui/interact/ui-coord.hpp
index dca841317..8321f5e08 100644
--- a/src/gui/interact/ui-coord.hpp
+++ b/src/gui/interact/ui-coord.hpp
@@ -62,6 +62,7 @@ namespace interact {
   
 //  using std::unique_ptr;
 //  using std::string;
+  using lib::Literal;
   
 //  class GlobalCtx;
   
@@ -78,9 +79,44 @@ namespace interact {
     {
       
     public:
+      static UICoord
+      currentWindow()
+        {
+          UNIMPLEMENTED ("UI coordinate builder function to indicate coordinates rooted within the current window");
+        }
+      
+      UICoord
+      view (Literal viewID)  const
+        {
+          UNIMPLEMENTED ("augment UI coordinates to indicate a specific view to be used");
+        }
+      
+      UICoord
+      tab (Literal tabID)  const
+        {
+          UNIMPLEMENTED ("augment UI coordinates to indicate a specific tab within the view");
+        }
+      
+      UICoord
+      tab (uint tabIdx)  const
+        {
+          UNIMPLEMENTED ("augment UI coordinates to indicate a tab specified by index number");
+        }
       
     private:
       
+    public:
+      friend bool
+      operator== (UICoord const& l, UICoord const& r)
+      {
+        UNIMPLEMENTED ("equality of UI coordinates");
+      }
+      
+      friend bool
+      operator!= (UICoord const& l, UICoord const& r)
+      {
+        return not (l == r);
+      }
     };
   
   
diff --git a/src/gui/interact/view-spec-dsl.hpp b/src/gui/interact/view-spec-dsl.hpp
index 7d36781d2..0157d1dde 100644
--- a/src/gui/interact/view-spec-dsl.hpp
+++ b/src/gui/interact/view-spec-dsl.hpp
@@ -95,8 +95,10 @@
 
 #include "lib/error.hpp"
 #include "lib/symbol.hpp"
+#include "gui/interact/ui-coord.hpp"
 
 //#include <boost/noncopyable.hpp>
+#include <functional>
 //#include <string>
 //#include <memory>
 
@@ -112,20 +114,53 @@ namespace interact {
   
   
   /**
-   * A specification to describe the desired location of a
-   * component view within the Lumiera UI.
+   * A specification to describe the desired location of a component view within the Lumiera UI.
+   * ViewSpec is basically a set of [UI coordinates](\ref UICoord), with the additional possibility
+   * of specifying several alternatives, with the intention to pick the first applicable one.
    * 
    * @todo initial draft as of 9/2017
    */
-  class LocationSpec
+  class ViewSpec
     {
       
     public:
+      ViewSpec(UICoord coordinates)
+        {
+          UNIMPLEMENTED ("build a view spec from explicitly given UI coordinates");
+        }
       
+      operator UICoord()
+        {
+          UNIMPLEMENTED ("resolve a view spec to yield explicit UI coordinates");
+        }
     private:
       
     };
   
   
+  /**
+   * Allocator is a functor to resolve a given, desired location of a view within the UI, resulting
+   * in creation or allocation of the view. The result of this invocation are the UI coordinates
+   * of an existing or newly created view.
+   */
+  class Allocator
+    : public std::function<UICoord(UICoord)>
+    {
+      
+    };
+  
+  
+  template<typename PAR>
+  class AllocSpec
+    : public std::function<Allocator(PAR)>
+    {
+    public:
+      template<class FUN>
+      AllocSpec(FUN fun)
+        {
+          UNIMPLEMENTED ("generate an allocator builder functor by partial function application");
+        }
+    };
+  
 }}// namespace gui::interact
 #endif /*GUI_INTERACT_VIEW_SPEC_DSL_H*/
diff --git a/tests/gui/interact/view-spec-dsl-test.cpp b/tests/gui/interact/view-spec-dsl-test.cpp
index 14b5e3a9c..a73f119e0 100644
--- a/tests/gui/interact/view-spec-dsl-test.cpp
+++ b/tests/gui/interact/view-spec-dsl-test.cpp
@@ -112,7 +112,7 @@ namespace test {
           UICoord realView2 = alloc(targetLocation);
           CHECK (2 == allocCounter);
           CHECK (realView2 == UICoord::currentWindow().view("viewID").tab("2"));
-          CHECK (realView2 != realView);
+          CHECK (realView2 != realView1);
           
           UICoord realView3 = alloc(targetLocation);
           CHECK (3 == allocCounter);