diff --git a/src/arifmetic.cpp b/src/arifmetic.cpp
index ba34354..9c2b8c3 100644
--- a/src/arifmetic.cpp
+++ b/src/arifmetic.cpp
@@ -145,4 +145,4 @@ ObjectBase* Arifm_Pos(ObjectList* input)
  if(t==tr) return new ObjectReal(dynamic_cast<const ObjectReal*>(input->At(0))->Value());
 
  return 0;
-}
\ No newline at end of file
+}
diff --git a/src/arifmetic.h b/src/arifmetic.h
index 9fd4b5c..2c980b9 100644
--- a/src/arifmetic.h
+++ b/src/arifmetic.h
@@ -6,4 +6,15 @@ ObjectBase* Arifm_Mul(ObjectList* input);
 ObjectBase* Arifm_Div(ObjectList* input);
 ObjectBase* Arifm_Pow(ObjectList* input);
 ObjectBase* Arifm_Neg(ObjectList* input);
-ObjectBase* Arifm_Pos(ObjectList* input);
\ No newline at end of file
+ObjectBase* Arifm_Pos(ObjectList* input);
+
+template<class T>
+ObjectBase* Get(ObjectList* input)
+{
+ if(input->Size()!=2) return 0;
+ const ObjectBase* ob=input->At(0);
+ const ObjectBase* name=input->At(1);
+ if( (!IS_OTYPE(ob,T)) || (!IS_OTYPE(name,ObjectString)) ) return 0;
+
+ return dynamic_cast<const T*>(ob)->Get(dynamic_cast<const ObjectString*>(name)->Value());
+}
diff --git a/src/init.cpp b/src/init.cpp
index 5b418de..ddc8680 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -45,6 +45,9 @@ int RegisterArifmeticFunctions()
  RegisterFunction("POW",Arifm_Pow);
  RegisterFunction("POS",Arifm_Pos);
  RegisterFunction("NEG",Arifm_Neg);
+
+ RegisterFunction("GET",Get<ObjectList>);
+ RegisterFunction("GET",Get<ObjectPair>);
  return 0;
 }
 
diff --git a/src/object.cpp b/src/object.cpp
index 8c91507..a21186e 100644
--- a/src/object.cpp
+++ b/src/object.cpp
@@ -1,6 +1,35 @@
 #include "object.h"
+#include "globals.h"
 
 template<> EXPORT std::string ObjectSimple<bool>::type="bool";
 template<> EXPORT std::string ObjectSimple<int64_t>::type="integer";
 template<> EXPORT std::string ObjectSimple<double>::type="real";
 template<> EXPORT std::string ObjectSimple<std::string>::type="string";
+
+inline ObjectBase* OFunc::Evaluate(bool* err)
+{
+ *err=false;
+ if(G_funcs.find(name)==G_funcs.end())
+ {
+  *err=true;
+  COUT(ERROR)<<"Function "<<name<< " not found"<<std::endl;
+  return 0;
+ }
+ args->Evaluate(err);
+ if(*err)
+ {
+  COUT(ERROR)<<" in function call "<<Dump()<<std::endl;
+  return 0;
+ }
+
+ ObjectBase* ret;
+ auto p=G_funcs.equal_range(name);
+ for(auto f=p.first;f!=p.second;f++)
+ {
+  ret=(*(f->second))(args);
+  if(ret!=0) return ret;
+ }
+ *err=true;
+ COUT(ERROR)<<"Function(s) "<<name<< "can't evaluate expression "<<args->Dump()<<std::endl;
+ return 0;
+}
diff --git a/src/object.h b/src/object.h
index 6d09ecd..0d8ca51 100644
--- a/src/object.h
+++ b/src/object.h
@@ -7,12 +7,14 @@
 #include <vector>
 #include <sstream>
 #include <set>
+#include <memory>
 #include <typeinfo>
 #include <typeindex>
 #include "debug.h"
 
 // Check if pointer is ObjectBase derivative class
 #define IS_OTYPE(quo,equ) (std::type_index(typeid(*quo))==std::type_index(typeid(equ)))
+#define IS_OTYPEI(quo,equ) (std::type_index(typeid(quo))==std::type_index(typeid(equ)))
 
 // Base class for all objects
 class EXPORT ObjectBase
@@ -67,6 +69,9 @@ public:
  virtual std::string Dump() const {return "%"+Type()+"%";}
  virtual void UsedFuncs(std::set<std::string>& funcs) const {}
  virtual void UsedIdents(std::set<std::string>& ids) const {}
+ virtual ObjectBase* Copy() const=0;
+ virtual ObjectBase* Evaluate(bool* err) {*err=false; return 0;}
+ virtual ObjectBase* ReplaceVar(const std::string& vname, ObjectBase* ob) {return 0;}
 };
 
 // Template for objects without specific constructor/destructor
@@ -105,6 +110,7 @@ public:
    s<<val;
   return s.str();
  }
+ ObjectBase* Copy() const override {return new ObjectSimple<T>(val);}
 };
 
 // Simple objects
@@ -125,18 +131,14 @@ class EXPORT ObjectPair: public ObjectBase
 {
 private:
  std::string name;
- ObjectBase* val;
+ std::shared_ptr<ObjectBase> val;
 
 public:
- ObjectPair():val(0) {}
- ObjectPair(const std::string& n, ObjectBase* v):name(n),val(v) {}
- ObjectPair(const std::string* n, ObjectBase* v):name(*n),val(v) {}
- ~ObjectPair()
- {
-  if(val!=0) delete val;
-  val=0;
- }
- bool Exist() const {return 0==val;}
+ ObjectPair() {}
+ ObjectPair(const std::string& n, ObjectBase* v):name(n) {val.reset(v);}
+ ObjectPair(const std::string* n, ObjectBase* v):name(*n) {val.reset(v);}
+ ~ObjectPair() {}
+ bool Exist() const {return 0!=val.get();}
 
  bool Print() const override
  {
@@ -148,28 +150,55 @@ public:
  }
  std::string Type() const override {return "pair";}
  std::string Name() const {return name;}
- const ObjectBase* Value() const {return val;}
- void SetPair(const std::string& n, ObjectBase* v) {if(!Exist()) {name=n; val=v;}}
+ const ObjectBase* Value() const {return val.get();}
+ void SetPair(const std::string& n, ObjectBase* v) {if(!Exist()) {name=n; val.reset(v);}}
  std::string Dump() const override { return Name()+"="+val->Dump(); }
  void UsedFuncs(std::set<std::string>& funcs) const override {return val->UsedFuncs(funcs);}
  void UsedIdents(std::set<std::string>& ids) const override {return val->UsedIdents(ids);}
+ ObjectBase* Copy() const override
+ {
+  auto ret=new ObjectPair;
+  ret->name=name;
+  ret->val=val;
+  return ret;
+ }
+ ObjectBase* Evaluate(bool* err) override
+ {
+  auto p=val->Evaluate(err);
+  if(*err)
+  {
+   COUT(ERROR)<<" in pair "<<Dump()<<std::endl;
+   return 0;
+  }
+  if(0==p) return 0;
+  val.reset(p);
+  return 0;
+ }
+ ObjectBase* ReplaceVar(const std::string& vname, ObjectBase* ob) override
+ {
+  auto p=val->ReplaceVar(vname,ob);
+  if(0!=p) val.reset(p);
+  return 0;
+ }
+ ObjectBase* Get(const std::string& gname) const
+ {
+  if(gname==name) return val->Copy();
+  else return 0;
+ }
 };
 
 // Class for objects list
 class EXPORT ObjectList: public ObjectBase
 {
 private:
- std::vector<ObjectBase*> vals;
+ typedef std::vector<ObjectBase*> ListValues;
+ std::shared_ptr<ListValues> vals;
 
 public:
- ObjectList() {}
- ObjectList(ObjectBase* o) {PushBack(o);}
- ~ObjectList()
- {
-  for(auto& i: vals) delete i;
-  vals.clear();
- }
- bool Exist() const {return 0==vals.size();}
+ ObjectList() {vals.reset(new ListValues, [](ListValues* p){for(auto& i: *p) delete i; delete p;});}
+ ObjectList(ObjectBase* o) {vals.reset(new ListValues, [](ListValues* p){for(auto& i: *p) delete i; delete p;}); PushBack(o);}
+ ~ObjectList() {}
+ bool Exist() const {return 0==vals->size();}
 
  bool Print() const override
  {
@@ -178,41 +207,103 @@ public:
   COUT(INFO)<<"Number of elements: "<<Size()<<std::endl;
   return true;
  }
- std::vector<ObjectBase*>::size_type Size() const {return vals.size();}
+ ListValues::size_type Size() const {return vals->size();}
  std::string Type() const override {return "list";}
- ObjectList* PushBack(ObjectBase* p) {vals.push_back(p); return this;}
- const ObjectBase* At(std::vector<ObjectBase*>::size_type i) const {return vals[i];}
+ ObjectList* PushBack(ObjectBase* p) {vals->push_back(p); return this;}
+ const ObjectBase* At(ListValues::size_type i) const {return (*vals)[i];}
  std::string Dump() const override
  {
   std::string s("(");
-  for(auto& i: vals) s+=i->Dump()+", ";
-  if(vals.size()!=0) s.resize(s.length()-2);
+  for(auto& i: *vals) s+=i->Dump()+", ";
+  if(vals->size()!=0) s.resize(s.length()-2);
   return s+")";
  }
- void UsedFuncs(std::set<std::string>& funcs) const override {for(auto& i: vals) i->UsedFuncs(funcs);}
- void UsedIdents(std::set<std::string>& ids) const override {for(auto& i: vals) i->UsedIdents(ids);}
+ void UsedFuncs(std::set<std::string>& funcs) const override {for(auto& i: *vals) i->UsedFuncs(funcs);}
+ void UsedIdents(std::set<std::string>& ids) const override {for(auto& i: *vals) i->UsedIdents(ids);}
+ ObjectBase* Copy() const override
+ {
+  auto ret=new ObjectList;
+  ret->vals=vals;
+  return ret;
+ }
+ ObjectBase* Evaluate(bool* err) override
+ {
+  ObjectBase* p;
+  for(auto& i: *vals)
+  {
+   p=i->Evaluate(err);
+   if(*err)
+   {
+    COUT(ERROR)<<" in list member "<<i->Dump()<<std::endl;
+    return 0;
+   }
+   if(0!=p)
+   {
+    delete i;
+    i=p;
+   }
+  }
+  return 0;
+ }
+ ObjectBase* ReplaceVar(const std::string& vname, ObjectBase* ob) override
+ {
+  ObjectBase* p;
+  for(auto& i: *vals)
+  {
+   p=i->ReplaceVar(vname,ob);
+   if(0!=p)
+   {
+    delete i;
+    i=p;
+   }
+  }
+  return 0;
+ }
+ ObjectBase* Get(const std::string& gname) const
+ {
+  ObjectBase* p;
+  for(auto& i: *vals)
+  {
+   p=0;
+   if(IS_OTYPEI(i,ObjectPair)) p=dynamic_cast<const ObjectPair*>(i)->Get(gname);
+   if(0!=p) return p;
+   if(IS_OTYPEI(i,ObjectList)) p=dynamic_cast<const ObjectList*>(i)->Get(gname);
+   if(0!=p) return p;
+  }
+  return 0;
+ }
 };
 
 // Class for storing identifiers
 class OId: public ObjectBase
 {
  std::string name;
- std::string fullname;
 
- void ParseName(const std::string& s)
- {
-  fullname=s;
-  name=s.substr(0,s.find_first_of('.'));
- }
 public:
- OId(const std::string* t) {ParseName(*t);}
+ OId(const std::string* t) {name=*t;}
  ~OId() {}
  bool Print() const override {return false;}
  std::string Type() const override {return "IDENT";}
  std::string Name() const {return name;}
- void SetName(std::string s) {ParseName(s);}
- std::string Dump() const override {return fullname;};
+ void SetName(const std::string& s) {name=s;}
+ std::string Dump() const override {return name;};
  void UsedIdents(std::set<std::string>& ids) const override {ids.insert(name);}
+ ObjectBase* Copy() const override
+ {
+  COUT(WARNING)<<"OId::Copy: this call must never be happens."<<std::endl;
+  return new OId(&name);
+ }
+ ObjectBase* Evaluate(bool* err) override
+ {
+  COUT(ERROR)<<"Variable "<<name<<" still not defined."<<std::endl;
+  *err=true;
+  return 0;
+ }
+ ObjectBase* ReplaceVar(const std::string& vname, ObjectBase* ob) override
+ {
+  if(vname==Name()) return ob->Copy();
+  else return 0;
+ }
 };
 
 // Class for storing functions
@@ -239,6 +330,16 @@ public:
  std::string Dump() const override {return Name()+args->Dump();};
  void UsedFuncs(std::set<std::string>& funcs) const override {funcs.insert(name); args->UsedFuncs(funcs);}
  void UsedIdents(std::set<std::string>& ids) const override {args->UsedIdents(ids);}
+ ObjectBase* Copy() const override
+ {
+  COUT(WARNING)<<"OFunc::Copy: this call must never be happens."<<std::endl;
+  return new OFunc(&name,args->Copy());
+ }
+ ObjectBase* Evaluate(bool* err) override;
+ ObjectBase* ReplaceVar(const std::string& vname, ObjectBase* ob) override
+ {
+  return args->ReplaceVar(vname,ob);
+ }
 };
 
 #endif
diff --git a/src/parser/grammatical.y b/src/parser/grammatical.y
index 7e13372..d98dd86 100644
--- a/src/parser/grammatical.y
+++ b/src/parser/grammatical.y
@@ -50,7 +50,9 @@ inline void conferror(YYLTYPE *locp, yyscan_t sc, const char * str)
 %left '*' '/'
 %precedence UNARY /* negation--unary minus */
 %right '^'        /* exponentiation */
+%left '.'
 
+%type <ob> longidentifier
 %type <ob> expression
 %type <ob> call
 %type <ob> object
@@ -120,8 +122,14 @@ call:
         IDENTIFIER OBRACE object CBRACE         {COUT(DEBUG)<<" IDENTIFIER OBRACE object CBRACE\n"; $$=new OFunc($1,$3); delete $1;}
         | IDENTIFIER OBRACE list CBRACE         {COUT(DEBUG)<<" IDENTIFIER OBRACE list CBRACE\n"; $$=new OFunc($1,$3); delete $1;}
 
+
+longidentifier:
+        IDENTIFIER '.' IDENTIFIER               {COUT(DEBUG)<<" IDENTIFIER DOT IDENTIFIER\n"; $$=new OFunc("GET",(new ObjectList(new OId($1)))->PushBack(new ObjectString($3))); delete $1; delete $3;}
+        | longidentifier '.' IDENTIFIER         {COUT(DEBUG)<<" longidentifier '.' IDENTIFIER\n"; $$=new OFunc("GET",(new ObjectList($1))->PushBack(new ObjectString($3))); delete $3;}
+
 expression:
         IDENTIFIER                              {COUT(DEBUG)<<" IDENTIFIER\n"; $$=new OId($1); delete $1;}
+        | longidentifier                        {COUT(DEBUG)<<" longidentifier\n"; $$=$1;}
         | REAL                                  {COUT(DEBUG)<<" REAL\n"; $$=new ObjectReal($1);}
         | INTEGER                               {COUT(DEBUG)<<" INTEGER\n"; $$=new ObjectInt($1);}
         | expression '-' expression             {COUT(DEBUG)<<" -\n"; $$=new OFunc("SUB",(new ObjectList($1))->PushBack($3));}
diff --git a/src/parser/lexical.l b/src/parser/lexical.l
index 7ac72b4..8062dc5 100644
--- a/src/parser/lexical.l
+++ b/src/parser/lexical.l
@@ -57,7 +57,8 @@ include\(\".+\"\);                              {/*
 <PARSE>\;					COUT(MOREDEBUG)<<" ENDL()"<<std::endl; BEGIN(0); return ENDL;
 <PARSE>=					COUT(MOREDEBUG)<<" ASSIGN()"; return ASSIGN;
 <PARSE>,                                        COUT(MOREDEBUG)<<" DELIM()"; return DELIM;
-<PARSE>([a-zA-Z][a-zA-Z0-9_]*\.)*[a-zA-Z][a-zA-Z0-9_]*		COUT(MOREDEBUG)<<" IDENTIFIER("<<yytext<<")"; yylval_param->str=new std::string(yytext); return IDENTIFIER;
+<PARSE>[a-zA-Z][a-zA-Z0-9_]*		        COUT(MOREDEBUG)<<" IDENTIFIER("<<yytext<<")"; yylval_param->str=new std::string(yytext); return IDENTIFIER;
+<PARSE>\.                                       COUT(MOREDEBUG)<<" DOT()"; return yytext[0];
 <PARSE,INITIAL>[ \n\t]
 <PARSE,INITIAL>\#.*
 <PARSE>\"				        BEGIN(PSTRING); str.erase();