diff --git a/rsconcept/frontend/src/dialogs/DlgCreateCst.tsx b/rsconcept/frontend/src/dialogs/DlgCreateCst.tsx
index 02db34b7..29deb9ea 100644
--- a/rsconcept/frontend/src/dialogs/DlgCreateCst.tsx
+++ b/rsconcept/frontend/src/dialogs/DlgCreateCst.tsx
@@ -5,9 +5,10 @@ import SelectSingle from '../components/Common/SelectSingle';
 import TextArea from '../components/Common/TextArea';
 import TextInput from '../components/Common/TextInput';
 import RSInput from '../components/RSInput';
+import usePartialUpdate from '../hooks/usePartialUpdate';
 import { CstType,ICstCreateData, IRSForm } from '../models/rsform';
 import { labelCstType } from '../utils/labels';
-import { createAliasFor, getCstTypePrefix } from '../utils/misc';
+import { createAliasFor, validateCstAlias } from '../utils/misc';
 import { SelectorCstType } from '../utils/selectors';
 
 interface DlgCreateCstProps
@@ -19,53 +20,31 @@ extends Pick<ModalProps, 'hideWindow'> {
 
 function DlgCreateCst({ hideWindow, initial, schema, onCreate }: DlgCreateCstProps) {
   const [validated, setValidated] = useState(false);
-  const [selectedType, setSelectedType] = useState<CstType>(CstType.BASE);
-  const [alias, setAlias] = useState('');
-  
-  const [term, setTerm] = useState('');
-  const [textDefinition, setTextDefinition] = useState('');
-  const [expression, setExpression] = useState('');
-  const [convention, setConvention] = useState('');
 
-  function getData(): ICstCreateData {
-    return {
-      cst_type: selectedType,
-      insert_after: initial?.insert_after ?? null,
-      alias: alias,
-      convention: convention,
-      definition_formal: expression,
-      definition_raw: textDefinition,
-      term_raw: term,
+  const [cstData, updateCstData] = usePartialUpdate(
+    initial || {
+      cst_type: CstType.BASE,
+      insert_after: null,
+      alias: '',
+      convention: '',
+      definition_formal: '',
+      definition_raw: '',
+      term_raw: '',
       term_forms: []
-    };
-  }
-
-  const handleSubmit = () => onCreate(getData());
-
-  useLayoutEffect(() => {
-    if (initial) {
-      setSelectedType(initial.cst_type);
-      setTerm(initial.term_raw);
-      setTextDefinition(initial.definition_raw);
-      setExpression(initial.definition_formal);
-      setConvention(initial.convention);
-      setAlias(initial.alias);
     }
-  }, [initial]);
+  );
+
+  const handleSubmit = () => onCreate(cstData);
 
   useLayoutEffect(
   () => {
-    setAlias(createAliasFor(selectedType, schema));
-  }, [selectedType, schema]);
+    updateCstData({ alias: createAliasFor(cstData.cst_type, schema) });
+  }, [cstData.cst_type, updateCstData, schema]);
 
   useEffect(
   () => {
-    if(alias.length < 2 || alias[0] !== getCstTypePrefix(selectedType)) {
-      setValidated(false);
-    } else {
-      setValidated(!schema.items.find(cst => cst.alias === alias))
-    }
-  }, [alias, selectedType, schema]);
+    setValidated(validateCstAlias(cstData.alias, cstData.cst_type, schema));
+  }, [cstData.alias, cstData.cst_type, schema]);
 
   return (
     <Modal
@@ -81,43 +60,43 @@ function DlgCreateCst({ hideWindow, initial, schema, onCreate }: DlgCreateCstPro
           className='my-2 min-w-[15rem] self-center'
           options={SelectorCstType}
           placeholder='Выберите тип'
-          value={selectedType ? { value: selectedType, label: labelCstType(selectedType) } : null}
-          onChange={data => setSelectedType(data?.value ?? CstType.BASE)}
+          value={{ value: cstData.cst_type, label: labelCstType(cstData.cst_type) }}
+          onChange={data => updateCstData({ cst_type: data?.value ?? CstType.BASE})}
         />
         <TextInput id='alias' label='Имя'
           dense
           dimensions='w-[7rem]'
-          value={alias}
-          onChange={event => setAlias(event.target.value)}
+          value={cstData.alias}
+          onChange={event => updateCstData({ alias: event.target.value})}
         />
       </div>
       <TextArea id='term' label='Термин'
         placeholder='Схемный или предметный термин, обозначающий данное понятие или утверждение'
         rows={2}
-        value={term}
+        value={cstData.term_raw}
         spellCheck
-        onChange={event => setTerm(event.target.value)}
+        onChange={event => updateCstData({ term_raw: event.target.value })}
       />
       <RSInput id='expression' label='Формальное выражение'
         placeholder='Родоструктурное выражение, задающее формальное определение'
         editable
         height='4.8rem'
-        value={expression}
-        onChange={value => setExpression(value)}
+        value={cstData.definition_formal}
+        onChange={value => updateCstData({definition_formal: value})}
       />
       <TextArea id='definition' label='Текстовое определение'
         placeholder='Лингвистическая интерпретация формального выражения'
         rows={2}
-        value={textDefinition}
+        value={cstData.definition_raw}
         spellCheck
-        onChange={event => setTextDefinition(event.target.value)}
+        onChange={event => updateCstData({ definition_raw: event.target.value })}
       />
       <TextArea id='convention' label='Конвенция / Комментарий'
         placeholder='Договоренность об интерпретации неопределяемого понятия&#x000D;&#x000A;Комментарий к производному понятию'
         rows={2}
-        value={convention}
+        value={cstData.convention}
         spellCheck
-        onChange={event => setConvention(event.target.value)}
+        onChange={event => updateCstData({ convention: event.target.value })}
       />
     </div>
     </Modal>
diff --git a/rsconcept/frontend/src/dialogs/DlgGraphOptions.tsx b/rsconcept/frontend/src/dialogs/DlgGraphOptions.tsx
index 69abf63d..74b2f914 100644
--- a/rsconcept/frontend/src/dialogs/DlgGraphOptions.tsx
+++ b/rsconcept/frontend/src/dialogs/DlgGraphOptions.tsx
@@ -1,7 +1,6 @@
-import { useLayoutEffect, useState } from 'react';
-
 import Checkbox from '../components/Common/Checkbox';
 import Modal, { ModalProps } from '../components/Common/Modal';
+import usePartialUpdate from '../hooks/usePartialUpdate';
 import { GraphEditorParams } from '../models/miscelanious';
 import { CstType } from '../models/rsform';
 import { labelCstType } from '../utils/labels';
@@ -12,60 +11,14 @@ extends Pick<ModalProps, 'hideWindow'> {
   onConfirm: (params: GraphEditorParams) => void
 }
 
-function DlgGraphOptions({ hideWindow, initial, onConfirm }:DlgGraphOptionsProps) {
-  const [ noHermits, setNoHermits ] = useState(true);
-  const [ noTransitive, setNoTransitive ] = useState(false);
-  const [ noTemplates, setNoTemplates ] = useState(true);
-  const [ noTerms, setNoTerms ] = useState(true);
-
-  const [ allowBase, setAllowBase ] = useState(true);
-  const [ allowStruct, setAllowStruct ] = useState(true);
-  const [ allowTerm, setAllowTerm ] = useState(true);
-  const [ allowAxiom, setAllowAxiom ] = useState(true);
-  const [ allowFunction, setAllowFunction ] = useState(true);
-  const [ allowPredicate, setAllowPredicate ] = useState(true);
-  const [ allowConstant, setAllowConstant ] = useState(true);
-  const [ allowTheorem, setAllowTheorem ] = useState(true);
-
-  function getParams() {
-    return {
-      noHermits: noHermits,
-      noTransitive: noTransitive,
-      noTemplates: noTemplates,
-      noTerms: noTerms,
-
-      allowBase: allowBase,
-      allowStruct: allowStruct,
-      allowTerm: allowTerm,
-      allowAxiom: allowAxiom,
-      allowFunction: allowFunction,
-      allowPredicate: allowPredicate,
-      allowConstant: allowConstant,
-      allowTheorem: allowTheorem
-    }
-  }
+function DlgGraphOptions({ hideWindow, initial, onConfirm } : DlgGraphOptionsProps) {
+  const [params, updateParams] = usePartialUpdate(initial);
 
   const handleSubmit = () => {
     hideWindow();
-    onConfirm(getParams());
+    onConfirm(params);
   };
 
-  useLayoutEffect(() => {
-    setNoHermits(initial.noHermits);
-    setNoTransitive(initial.noTransitive);
-    setNoTemplates(initial.noTemplates);
-    setNoTerms(initial.noTerms);
-
-    setAllowBase(initial.allowBase);
-    setAllowStruct(initial.allowStruct);
-    setAllowTerm(initial.allowTerm);
-    setAllowAxiom(initial.allowAxiom);
-    setAllowFunction(initial.allowFunction);
-    setAllowPredicate(initial.allowPredicate);
-    setAllowConstant(initial.allowConstant);
-    setAllowTheorem(initial.allowTheorem);
-  }, [initial]);
-
   return (
     <Modal
       hideWindow={hideWindow}
@@ -80,69 +33,69 @@ function DlgGraphOptions({ hideWindow, initial, onConfirm }:DlgGraphOptionsProps
           <Checkbox
             label='Скрыть текст'
             tooltip='Не отображать термины'
-            value={noTerms} 
-            setValue={ value => setNoTerms(value) }
+            value={params.noTerms} 
+            setValue={ value => updateParams({noTerms: value}) }
           />
           <Checkbox
             label='Скрыть несвязанные'
             tooltip='Неиспользуемые конституенты'
-            value={noHermits} 
-            setValue={ value => setNoHermits(value) }
+            value={params.noHermits} 
+            setValue={ value => updateParams({ noHermits: value}) }
           />
           <Checkbox
             label='Скрыть шаблоны'
             tooltip='Терм-функции и предикат-функции с параметризованными аргументами'
-            value={noTemplates} 
-            setValue={ value => setNoTemplates(value) }
+            value={params.noTemplates} 
+            setValue={ value => updateParams({ noTemplates: value}) }
           />
           <Checkbox
             label='Транзитивная редукция'
             tooltip='Удалить связи, образующие транзитивные пути в графе'
-            value={noTransitive} 
-            setValue={ value => setNoTransitive(value) }
+            value={params.noTransitive} 
+            setValue={ value => updateParams({ noTransitive: value}) }
           />
         </div>
         <div className='flex flex-col gap-1'>
           <h1>Типы конституент</h1>
           <Checkbox
             label={labelCstType(CstType.BASE)}
-            value={allowBase} 
-            setValue={ value => setAllowBase(value) }
+            value={params.allowBase} 
+            setValue={ value => updateParams({ allowBase: value}) }
           />
           <Checkbox
             label={labelCstType(CstType.STRUCTURED)}
-            value={allowStruct} 
-            setValue={ value => setAllowStruct(value) }
+            value={params.allowStruct} 
+            setValue={ value => updateParams({ allowStruct: value}) }
           />
           <Checkbox
             label={labelCstType(CstType.TERM)}
-            value={allowTerm} 
-            setValue={ value => setAllowTerm(value) }
+            value={params.allowTerm} 
+            setValue={ value => updateParams({ allowTerm: value}) }
           />
           <Checkbox
             label={labelCstType(CstType.AXIOM)}
-            value={allowAxiom} 
-            setValue={ value => setAllowAxiom(value) }
+            value={params.allowAxiom} 
+            setValue={ value => updateParams({ allowAxiom: value}) }
           />
           <Checkbox
             label={labelCstType(CstType.FUNCTION)}
-            value={allowFunction} 
-            setValue={ value => setAllowFunction(value) }
+            value={params.allowFunction} 
+            setValue={ value => updateParams({ allowFunction: value}) }
           />
           <Checkbox
             label={labelCstType(CstType.PREDICATE)}
-            value={allowPredicate} 
-            setValue={ value => setAllowPredicate(value) }
+            value={params.allowPredicate} 
+            setValue={ value => updateParams({ allowPredicate: value}) }
           />
           <Checkbox
             label={labelCstType(CstType.CONSTANT)}
-            value={allowConstant} 
-            setValue={ value => setAllowConstant(value) }
+            value={params.allowConstant} 
+            setValue={ value => updateParams({ allowConstant: value}) }
           />
           <Checkbox
             label={labelCstType(CstType.THEOREM)}
-            value={allowTheorem} 
-            setValue ={ value => setAllowTheorem(value) }
+            value={params.allowTheorem} 
+            setValue ={ value => updateParams({ allowTheorem: value}) }
           />
         </div>
       </div>
diff --git a/rsconcept/frontend/src/dialogs/DlgRenameCst.tsx b/rsconcept/frontend/src/dialogs/DlgRenameCst.tsx
index f9505f97..14a23c79 100644
--- a/rsconcept/frontend/src/dialogs/DlgRenameCst.tsx
+++ b/rsconcept/frontend/src/dialogs/DlgRenameCst.tsx
@@ -4,60 +4,40 @@ import Modal, { ModalProps } from '../components/Common/Modal';
 import SelectSingle from '../components/Common/SelectSingle';
 import TextInput from '../components/Common/TextInput';
 import { useRSForm } from '../context/RSFormContext';
+import usePartialUpdate from '../hooks/usePartialUpdate';
 import { CstType, ICstRenameData } from '../models/rsform';
 import { labelCstType } from '../utils/labels';
-import { createAliasFor, getCstTypePrefix } from '../utils/misc';
+import { createAliasFor, validateCstAlias } from '../utils/misc';
 import { SelectorCstType } from '../utils/selectors';
 
 interface DlgRenameCstProps
 extends Pick<ModalProps, 'hideWindow'> {
-  initial?: ICstRenameData
+  initial: ICstRenameData
   onRename: (data: ICstRenameData) => void
 }
 
 function DlgRenameCst({ hideWindow, initial, onRename }: DlgRenameCstProps) {
   const { schema } = useRSForm();
   const [validated, setValidated] = useState(false);
-  const [cstType, setCstType] = useState<CstType>(CstType.BASE);
-  const [cstID, setCstID] = useState(0)
-  const [alias, setAlias] = useState('');
-
-  function getData(): ICstRenameData {
-    return {
-      cst_type: cstType,
-      alias: alias,
-      id: cstID
-    }
-  }
-
-  const handleSubmit = () => onRename(getData());
+  const [cstData, updateData] = usePartialUpdate(initial);
+  
+  const handleSubmit = () => onRename(cstData);
 
   useLayoutEffect(
   () => {
-    if (schema && initial && cstType !== initial.cst_type) {
-      setAlias(createAliasFor(cstType, schema));
+    if (schema && initial && cstData.cst_type !== initial.cst_type) {
+      updateData({ alias: createAliasFor(cstData.cst_type, schema)});
     }
-  }, [initial, cstType, schema]);
+  }, [initial, cstData.cst_type, updateData, schema]);
 
   useLayoutEffect(
   () => {
-    if (initial) {
-      setCstType(initial.cst_type);
-      setAlias(initial.alias);
-      setCstID(initial.id);
-    }
-  }, [initial]);
-
-  useLayoutEffect(
-  () => {
-    if (!initial ||  !schema) {
-      setValidated(false);
-    } else if(alias === initial.alias || alias.length < 2 || alias[0] !== getCstTypePrefix(cstType)) {
-      setValidated(false);
-    } else {
-      setValidated(!schema.items.find(cst => cst.alias === alias))
-    }
-  }, [cstType, alias, initial, schema]);
+    setValidated(
+      !!schema &&
+      cstData.alias !== initial.alias &&
+      validateCstAlias(cstData.alias, cstData.cst_type, schema)
+    );
+  }, [cstData.cst_type, cstData.alias, initial, schema]);
 
   return (
     <Modal
@@ -73,15 +53,15 @@ function DlgRenameCst({ hideWindow, initial, onRename }: DlgRenameCstProps) {
           className='min-w-[14rem] self-center z-modal-top'
           options={SelectorCstType}
           placeholder='Выберите тип'
-          value={cstType ? { value: cstType, label: labelCstType(cstType) } : null}
-          onChange={data => setCstType(data?.value ?? CstType.BASE)}
+          value={{ value: cstData.cst_type, label: labelCstType(cstData.cst_type) }}
+          onChange={data => updateData({cst_type: data?.value ?? CstType.BASE})}
         />
         <div>
         <TextInput id='alias' label='Имя'
           dense
           dimensions='w-[7rem]'
-          value={alias}
-          onChange={event => setAlias(event.target.value)}
+          value={cstData.alias}
+          onChange={event => updateData({alias: event.target.value})}
         />
         </div>
       </div>
diff --git a/rsconcept/frontend/src/dialogs/DlgTemplates.tsx b/rsconcept/frontend/src/dialogs/DlgTemplates/index.tsx
similarity index 59%
rename from rsconcept/frontend/src/dialogs/DlgTemplates.tsx
rename to rsconcept/frontend/src/dialogs/DlgTemplates/index.tsx
index 4547304d..6ca8c65b 100644
--- a/rsconcept/frontend/src/dialogs/DlgTemplates.tsx
+++ b/rsconcept/frontend/src/dialogs/DlgTemplates/index.tsx
@@ -1,18 +1,19 @@
 import { useEffect, useLayoutEffect, useState } from 'react';
 
-import ConceptTooltip from '../components/Common/ConceptTooltip';
-import Modal, { ModalProps } from '../components/Common/Modal';
-import SelectSingle from '../components/Common/SelectSingle';
-import SwitchButton from '../components/Common/SwitchButton';
-import TextArea from '../components/Common/TextArea';
-import TextInput from '../components/Common/TextInput';
-import HelpRSTemplates from '../components/Help/HelpRSTemplates';
-import { HelpIcon } from '../components/Icons';
-import RSInput from '../components/RSInput';
-import { CstType,ICstCreateData, IRSForm } from '../models/rsform';
-import { labelCstType } from '../utils/labels';
-import { createAliasFor, getCstTypePrefix } from '../utils/misc';
-import { SelectorCstType } from '../utils/selectors';
+import ConceptTooltip from '../../components/Common/ConceptTooltip';
+import Modal, { ModalProps } from '../../components/Common/Modal';
+import SelectSingle from '../../components/Common/SelectSingle';
+import SwitchButton from '../../components/Common/SwitchButton';
+import TextArea from '../../components/Common/TextArea';
+import TextInput from '../../components/Common/TextInput';
+import HelpRSTemplates from '../../components/Help/HelpRSTemplates';
+import { HelpIcon } from '../../components/Icons';
+import RSInput from '../../components/RSInput';
+import usePartialUpdate from '../../hooks/usePartialUpdate';
+import { CstType,ICstCreateData, IRSForm } from '../../models/rsform';
+import { labelCstType } from '../../utils/labels';
+import { createAliasFor, validateCstAlias } from '../../utils/misc';
+import { SelectorCstType } from '../../utils/selectors';
 
 interface DlgTemplatesProps
 extends Pick<ModalProps, 'hideWindow'> {
@@ -22,44 +23,30 @@ extends Pick<ModalProps, 'hideWindow'> {
 
 function DlgTemplates({ hideWindow, schema, onCreate }: DlgTemplatesProps) {
   const [validated, setValidated] = useState(false);
-  const [selectedType, setSelectedType] = useState<CstType>(CstType.TERM);
-  const [alias, setAlias] = useState('');
-  
-  const [term, setTerm] = useState('');
-  const [textDefinition, setTextDefinition] = useState('');
-  const [expression, setExpression] = useState('');
-  const [convention, setConvention] = useState('');
+  const [cstData, updateCstData] = usePartialUpdate({
+    cst_type: CstType.TERM,
+    insert_after: null,
+    alias: '',
+    convention: '',
+    definition_formal: '',
+    definition_raw: '',
+    term_raw: '',
+    term_forms: []
+  });
 
   const [ showAttributes, setShowAttributes ] = useState(false);
 
-  function getData(): ICstCreateData {
-    return {
-      cst_type: selectedType,
-      insert_after: null,
-      alias: alias,
-      convention: convention,
-      definition_formal: expression,
-      definition_raw: textDefinition,
-      term_raw: term,
-      term_forms: []
-    };
-  }
-
-  const handleSubmit = () => onCreate(getData());
+  const handleSubmit = () => onCreate(cstData);
   
   useLayoutEffect(
   () => {
-    setAlias(createAliasFor(selectedType, schema));
-  }, [selectedType, schema]);
+    updateCstData({ alias: createAliasFor(cstData.cst_type, schema) });
+  }, [cstData.cst_type, updateCstData, schema]);
 
   useEffect(
   () => {
-    if(alias.length < 2 || alias[0] !== getCstTypePrefix(selectedType)) {
-      setValidated(false);
-    } else {
-      setValidated(!schema.items.find(cst => cst.alias === alias))
-    }
-  }, [alias, selectedType, schema]);
+    setValidated(validateCstAlias(cstData.alias, cstData.cst_type, schema));
+  }, [cstData.alias, cstData.cst_type, schema]);
 
   return (
   <Modal
@@ -111,43 +98,43 @@ function DlgTemplates({ hideWindow, schema, onCreate }: DlgTemplatesProps) {
           className='my-2 min-w-[15rem] self-center'
           options={SelectorCstType}
           placeholder='Выберите тип'
-          value={selectedType ? { value: selectedType, label: labelCstType(selectedType) } : null}
-          onChange={data => setSelectedType(data?.value ?? CstType.BASE)}
+          value={{ value: cstData.cst_type, label: labelCstType(cstData.cst_type) }}
+          onChange={data => updateCstData({ cst_type: data?.value ?? CstType.TERM})}
         />
         <TextInput id='alias' label='Имя'
           dense
           dimensions='w-[7rem]'
-          value={alias}
-          onChange={event => setAlias(event.target.value)}
+          value={cstData.alias}
+          onChange={event => updateCstData({ alias: event.target.value})}
         />
       </div>
       <TextArea id='term' label='Термин'
         placeholder='Схемный или предметный термин, обозначающий данное понятие или утверждение'
         rows={2}
-        value={term}
+        value={cstData.term_raw}
         spellCheck
-        onChange={event => setTerm(event.target.value)}
+        onChange={event => updateCstData({ term_raw: event.target.value })}
       />
       <RSInput id='expression' label='Формальное выражение'
         placeholder='Родоструктурное выражение, задающее формальное определение'
         editable
         height='4.8rem'
-        value={expression}
-        onChange={value => setExpression(value)}
+        value={cstData.definition_formal}
+        onChange={value => updateCstData({definition_formal: value})}
       />
       <TextArea id='definition' label='Текстовое определение'
         placeholder='Лингвистическая интерпретация формального выражения'
         rows={2}
-        value={textDefinition}
+        value={cstData.definition_raw}
         spellCheck
-        onChange={event => setTextDefinition(event.target.value)}
+        onChange={event => updateCstData({ definition_raw: event.target.value })}
       />
       <TextArea id='convention' label='Конвенция / Комментарий'
         placeholder='Договоренность об интерпретации неопределяемого понятия&#x000D;&#x000A;Комментарий к производному понятию'
         rows={2}
-        value={convention}
+        value={cstData.convention}
         spellCheck
-        onChange={event => setConvention(event.target.value)}
+        onChange={event => updateCstData({ convention: event.target.value })}
       />
     </div>}
   </div>
diff --git a/rsconcept/frontend/src/hooks/usePartialUpdate.tsx b/rsconcept/frontend/src/hooks/usePartialUpdate.tsx
new file mode 100644
index 00000000..de8eef3c
--- /dev/null
+++ b/rsconcept/frontend/src/hooks/usePartialUpdate.tsx
@@ -0,0 +1,15 @@
+import { useReducer } from 'react';
+
+function usePartialUpdate<ValueType>(initialValue: ValueType) {
+  const [value, updateValue] = useReducer(
+    (data: ValueType, newData: Partial<ValueType>) => ({
+      ...data,
+      ...newData,
+    }),
+    initialValue
+  );
+
+  return [value, updateValue] as [ValueType, typeof updateValue];
+}
+
+export default usePartialUpdate;
diff --git a/rsconcept/frontend/src/pages/RSFormPage/RSTabs.tsx b/rsconcept/frontend/src/pages/RSFormPage/RSTabs.tsx
index 24407a2c..fc79bc89 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/RSTabs.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/RSTabs.tsx
@@ -360,7 +360,7 @@ function RSTabs() {
     <DlgRenameCst
       hideWindow={() => setShowRenameCst(false)}
       onRename={handleRenameCst}
-      initial={renameInitialData}
+      initial={renameInitialData!}
     />}
     {showDeleteCst && 
     <DlgDeleteCst
diff --git a/rsconcept/frontend/src/utils/misc.ts b/rsconcept/frontend/src/utils/misc.ts
index 1e900091..8e093b5b 100644
--- a/rsconcept/frontend/src/utils/misc.ts
+++ b/rsconcept/frontend/src/utils/misc.ts
@@ -19,6 +19,14 @@ export function getCstTypePrefix(type: CstType) {
   }
 }
 
+export function validateCstAlias(alias: string, type: CstType, schema: IRSForm): boolean {
+  return (
+    alias.length >= 2 &&
+    alias[0] == getCstTypePrefix(type) &&
+    !schema.items.find(cst => cst.alias === alias)
+  );
+}
+
 export function getCstExpressionPrefix(cst: IConstituenta): string {
   return cst.alias + (cst.cst_type === CstType.STRUCTURED ? '::=' : ':==');
 }