Index: openacs-4/packages/acs-tcl/tcl/tcl-documentation-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/tcl-documentation-procs.tcl,v
diff -u -r1.61.2.25 -r1.61.2.26
--- openacs-4/packages/acs-tcl/tcl/tcl-documentation-procs.tcl	14 Jul 2022 15:17:09 -0000	1.61.2.25
+++ openacs-4/packages/acs-tcl/tcl/tcl-documentation-procs.tcl	14 Jul 2022 16:55:16 -0000	1.61.2.26
@@ -1831,7 +1831,31 @@
     return 0
 }
 
+ad_page_contract_filter object_type { name object_id types } {
 
+    Checks whether the supplied object_id is an acs_object of one of
+    the types specified in the flag parameters.
+
+    The check will take the object_type hierarchy into account
+    e.g. will always succeed if one of the types is "acs_object". In
+    this case the filter will just behave as an existance check.
+
+} {
+    # First make sure the object_id formally correct
+    if { ![ad_page_contract_filter_proc_object_id $name object_id] } {
+        return 0
+    }
+
+    if { ![acs_object::is_type_p \
+               -object_id $object_id \
+               -object_types $types] } {
+        ad_complain [_ acs-tcl.lt_invalid_object_type]
+        return 0
+    }
+
+    return 1
+}
+
 ad_page_contract_filter range { name value range } {
     Checks whether the value falls between the specified range.
     Range must be a list of two elements: min and max.