XML metadata tutorial:

<?xml version="1.0" encoding="windows-1250"?>

<Storage Type = "ADODB" Connection = "...">
<String Name = "char"/>
<Date Name = "date"/>
<Integer Name = "Integer"/>
</Storage>

<Classifier Caption = "Classifier" Abstract = "Yes">
<ID Caption = "Code" Identity = "Yes" Type = "Float"/>
<Name Caption = "Name" Type = "String(100)"/>
</Classifier>

<Diagnosis Caption = "Diagnosis" Inherit = "Classifier"/>
<Visit Caption = "Visit" Inherit = "Classifier"/>

<Medical Caption = "Medical" Inherit = "Classifier">
<WorkTime Caption = "Work time" Type = "Integer"/>
<Curr Caption = "Cost" Type = "Float"/>
</Medical>

<Region Caption = "Regions" Inherit = "Classifier">
<Role Caption = "Role" Type ="Integer"/>
<Population Caption = "Population" Type ="Integer"/>
<Children Caption = "Children" Type ="Integer"/>
</Region>

<Subject Caption = "Subject" Abstract = "Yes" Inherit = "Classifier">
<Code Caption = "Code" Type = "String(50)"/>
<Role Caption = "Role" Type = "Integer"/>
<Address Caption = "Address" Type = "String"/>
<Phone Caption = "Phone" Type = "String(30)"/>
<Fax Caption = "Fax" Type = "String(30)"/>
<Mobile Caption = "Mobil phone" Type = "String(30)"/>
<Pager Caption = "Pager" Type = "String(30)"/>
<EMail Caption = "Email postbox" Type = "String(30)"/>
<Birth Caption = "Date of birth" Type = "Date"/>
<Comment Caption = "Comment" Type = "Memo"/>
</Subject>

<Department Caption = "Department" Inherit = "Subject">
<Region Caption = "Region" Type = "Region"/>
<Manager Caption = "Chief of department" Type = "String(50)"/>
<Accountant Caption = "Accountant" Type = "String(50)"/>
<Staff Caption = "Staff" Type = "Staff[]"/>
<Equipment Caption = "Equipment" Type = "Equipment[]"/>
<Regions Caption = "Region" Type = "Region[]"/>
</Departament>

<Doctor Caption = "Doctor" Inherit = "Subject">
<Departament Caption = "Departament" Type = "Departament"/>
<StartWork Caption = "StartWork" Type = "Date"/>
<EndWork Caption = "EndWork" Type = "Date"/> 
<Reception Caption = "Reception" Type = "Integer"/>
<Trade Caption = "Trade" Type = "Integer"/>
<Rank Caption = "Scientific rank" Type = "String(50)"/>
<Job Caption = "Job" Type = "String(50)"/>
<Sex Caption = "Gender" Type = "Integer"/>
</Doctor>

<Patient Caption = "Patient" Inherit = "Subject">
<Doctor Caption = "Doctor" Type = "Doctor"/>
<StartDate Caption = "StartDate" Type = "Date"/>
<Sex Caption = "Gender" Type = "Integer"/>
<CardNo Caption = "Registration number" Type = "String(50)"/>
<History Caption = "History" Type = "MedicalRecord[]"/>
<Looking Caption = "Looking" Type = "Looking[]"/>
<Lists Caption = "Lists" Type = "List[]"/>
</Patient>

<List Caption = "List">
<ID Caption = "Patient" Identity = "Yes" Type = "Patient"/>
<StartDate Caption = "StartDate" Identity = "Yes" Type = "Date"/>
<Doctor Caption = "Doctor" Type = "Doctor"/>
<Diagnosis Caption = "Diagnosis" Type = "Diagnosis"/>
<EndDate Caption = "EndDate" Type = "Date"/>
</List>

<MedicalRecord Caption = "The medical record">
<ID Identity = "Yes" Type = "Float"/>
<recordDate Type = "Date"/>
<endDate Type = "Date"/>
<recordMonth Type = "Integer"/>
<endMonth Type = "Integer"/>
<Role Caption = "Role" Type = "Integer"/>
<Doctor Caption = "Doctor" Type = "Doctor"/>
<Patient Caption = "Patient" Type = "Patient"/>
<Visit Caption = "Visit" Type = "Visit"/>
<Diagnosis Caption = "Diagnosis" Type = "Diagnosis"/>
<Medical Caption = "Medical" Type = "Medical"/>
<WorkTime Caption = "WorkTime" Type = "Integer"/>
<WorkCount Caption = "WorkCount" Type = "Integer"/>
<Curr Caption = "Cost" Type = "Float"/>
<Tooth Caption = "Tooth" Type = "String(20)"/>
<SurFace Caption = "SurFace" Type = "Integer"/>
<Comment Caption = "Comment" Type = "Memo"/>
</MedicalRecord>

<Staff Caption = "Staff">
<ID Identity = "Yes" Type = "Departament"/>
<ActualYear Identity = "Yes" Type = "Integer"/>
<Stomatologist1 Type = "Float"/>
<Stomatologist2 Type = "Float"/>
<Stomatologist3 Type = "Integer"/>
<Dentist1 Type = "Float"/>
<Dentist2 Type = "Float"/>
<Dentist3 Type = "Integer"/>
<Nurse1 Type = "Float"/>
<Nurse2 Type = "Float"/>
<Nurse3 Type = "Integer"/>
<Dental1 Type = "Float"/>
<Dental2 Type = "Float"/>
<Dental3 Type = "Integer"/>
<Worker1 Type = "Float"/>
<Worker2 Type = "Float"/>
<Worker3 Type = "Integer"/>
</Staff>

<Equipment Caption = "Equipment">
<ID Identity = "Yes" Type = "Departament"/>
<ActualYear Identity = "Yes" Type = "Integer"/>
<Stationary Type = "Integer"/>
<Mobile Type = "Integer"/>
<Laboratory Type = "Integer"/>
<WorkSeat Type = "Integer"/>
<RontgenOFDent Type = "Integer"/>
<RontgenOFPanoramic Type = "Integer"/>
</Equipment>

<Looking Caption = "Looking">
<ID Identity = "Yes" Type = "Patient"/>
<ActualYear Identity = "Yes" Type = "Integer"/>
</Looking>

</Entities>
</XML>