diff --git a/examples/simple/Concept_Example.thy b/examples/simple/Concept_Example.thy
deleted file mode 100644
index fadb3bb..0000000
--- a/examples/simple/Concept_Example.thy
+++ /dev/null
@@ -1,55 +0,0 @@
-chapter\<open>Setting and modifying attributes of doc-items\<close>
-
-theory Concept_Example
-  imports "../../ontologies/Conceptual" (* we use the generic "Conceptual" ontology *)
-begin
-
-text\<open>@{theory \<open>Draft.Conceptual\<close>} provides a monitor @{typ M} enforcing a particular document 
-     structure.  Here, we say: From now on, this structural rules are respected wrt. all 
-     \<^theory_text>\<open>doc_class\<close>es @{typ M} is enabled for.\<close>
-open_monitor*[struct::M]  
-
-section*[a::A, x = "3"] \<open> Lorem ipsum dolor sit amet, ... \<close>
-
-text*[c1::C, x = "''beta''"] \<open> ... suspendisse non arcu malesuada mollis, nibh morbi, ...  \<close>
-               
-text*[d::D, a1 = "X3"] \<open> ... phasellus amet id massa nunc, pede suscipit repellendus, 
-                         ... @{C c1} @{thm "refl"}\<close>
-
-
-update_instance*[d::D, a1 := X2]
-
-text\<open> ... in ut tortor ... @{docitem \<open>a\<close>} ... @{A \<open>a\<close>}\<close>  
-    
-text*[c2::C, x = "''delta''"]  \<open> ... in ut tortor eleifend augue pretium consectetuer.  \<close>
-
-text*[f::F] \<open> Lectus accumsan velit ultrices, ... }\<close>
-  
-theorem some_proof : "P" sorry
-
-text\<open>This is an example where we add a theorem into a kind of "result-list" of the doc-item f.\<close>
-update_instance*[f::F,r:="[@{thm ''Concept_Example.some_proof''}]"]
-
-text\<open> ..., mauris amet, id elit aliquam aptent id,  ... @{docitem \<open>a\<close>} \<close>
-
-text\<open>Here we add and maintain a link that is actually modeled as m-to-n relation ...
-     The type annotations with @{typ A} and @{typ C} are optional and may help to get 
-     additional information at the HOL level, the arguments of the inner-syntax antiquotation
-     are strings that can be denoted in two different syntactic variants; the former is
-     more robust that the traditional latter.\<close>
-update_instance*[f::F,b:="{(@{docitem  \<open>a\<close>}::A,@{docitem  \<open>c1\<close>}::C), 
-                           (@{docitem  ''a''}, @{docitem  ''c2''})}"] 
-  
-close_monitor*[struct]
-
-text\<open>And the trace of the monitor is:\<close>
-ML\<open>@{trace_attribute struct}\<close>
-
-print_doc_classes
-print_doc_items
-
-check_doc_global
-
-
-end 
-  
\ No newline at end of file