c# code 39 generator The Core SOM Classes in C#

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The Core SOM Classes
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Figure 5-11 shows the object hierarchy of the core SOM classes. As you can see, all the SOM classes inherit from an abstract base class called XmlSchemaObject. This class provides common base functionality to all the child classes. The XmlSchemaAnnotated class represents a base class for any element that can contain annotation elements. Classes such as XmlSchema, XmlSchemaType, XmlSchemaAttribute, XmlSchemaParticle, and XmlSchemaFacet inherit from the XmlSchemaAnnotated class.
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Note You can use annotation elements to provide information about the XML schema. Annotations can
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appear anywhere in a schema to explain any element, attribute, or type definition.
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The XmlSchema class represents an in-memory representation of an XSD schema. This class allows you to read, write, and compile XSD schemas.
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CHAPTER 5 VA LIDATIN G XML DOCUMEN TS
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The XmlSchemaType represents a type in an XSD schema and acts as a base class for all simple and complex types. The XmlSchemaSimpleType and XmlSchemaComplexType classes inherit from this class and allow you to define new simple and complex types, respectively. The XmlSchemaAttribute represents an attribute of an element. Finally, the XmlSchemaParticle class provides base functionality to all particle types such as XmlSchemaElement.
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Figure 5-11. The SOM object hierarchy
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Creating an XSD Schema Using the SOM
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Now that you know what the SOM is, let s put it to use to create a schema for our Employees.xml file. The schema will have three simple types: Simple type for name: This simple type represents names used in our XML document (first name and last name). It restricts the name length; the minimum length is 3, and the maximum length is less than 255. Simple type for phone: This simple type represents phone numbers (the <homephone> element of our XML document). It enforces a restriction requiring phone numbers to be no longer than 20 characters. Simple type for notes: This simple type represents notes (the <notes> element of our document). It enforces a restriction requiring the notes entered to be no longer than 500 characters. These three simple types will make a complex type that represents an employee. The complex type consists of the following:
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CH AP T ER 5 VA LI D AT IN G X ML D OC UMEN TS
An element called <firstname>, which is a name simple type An element called <lastname>, which is a name simple type An element called <homephone>, which is a phone simple type An element called <notes>, which is a notes simple type A required attribute called employeeid, which is of type int Finally, we will have an element called <employees> that will contain zero or more subelements named <employee>. The <employee> subelements will be of the complex type I just mentioned. To create the schema by using the SOM, you need to create a Windows application like the one shown in Figure 5-12.
Figure 5-12. Application for creating a schema by using the SOM The application consists of a text box wherein you can specify the full path and name of the destination schema file. Clicking the Create Schema button generates, compiles, and saves the schema to the specified location. The Click event handler of the Create Schema button is shown in Listing 5-8. Listing 5-8. Creating a Schema by Using the SOM private void button1_Click(object sender, EventArgs e) { XmlSchema schema = new XmlSchema(); //define NameSimpleType XmlSchemaSimpleType nametype = new XmlSchemaSimpleType(); XmlSchemaSimpleTypeRestriction nameRes = new XmlSchemaSimpleTypeRestriction(); nameRes.BaseTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema"); XmlSchemaMinLengthFacet nameFacet1 = new XmlSchemaMinLengthFacet(); nameFacet1.Value = "3"; XmlSchemaMaxLengthFacet nameFacet2 = new XmlSchemaMaxLengthFacet(); nameFacet2.Value = "255"; nameRes.Facets.Add(nameFacet1); nameRes.Facets.Add(nameFacet2); nametype.Content = nameRes;
CHAPTER 5 VA LIDATIN G XML DOCUMEN TS
//define PhoneSimpleType XmlSchemaSimpleType phonetype = new XmlSchemaSimpleType(); XmlSchemaSimpleTypeRestriction phoneRes = new XmlSchemaSimpleTypeRestriction(); phoneRes.BaseTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema"); XmlSchemaMaxLengthFacet phoneFacet1 = new XmlSchemaMaxLengthFacet(); phoneFacet1.Value = "20"; phoneRes.Facets.Add(phoneFacet1); phonetype.Content = phoneRes; //define NotesSimpleType XmlSchemaSimpleType notestype = new XmlSchemaSimpleType(); XmlSchemaSimpleTypeRestriction notesRes = new XmlSchemaSimpleTypeRestriction(); notesRes.BaseTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema"); XmlSchemaMaxLengthFacet notesFacet1 = new XmlSchemaMaxLengthFacet(); notesFacet1.Value = "500"; notesRes.Facets.Add(notesFacet1); notestype.Content = notesRes; //define EmployeeType complex type XmlSchemaComplexType employeetype = new XmlSchemaComplexType(); XmlSchemaSequence sequence = new XmlSchemaSequence(); XmlSchemaElement firstname = new XmlSchemaElement(); firstname.Name = "firstname"; firstname.SchemaType = nametype; XmlSchemaElement lastname = new XmlSchemaElement(); lastname.Name = "lastname"; lastname.SchemaType = nametype; XmlSchemaElement homephone = new XmlSchemaElement(); homephone.Name = "homephone"; homephone.SchemaType = phonetype; XmlSchemaElement notes = new XmlSchemaElement(); notes.Name = "notes"; notes.SchemaType = notestype; sequence.Items.Add(firstname); sequence.Items.Add(lastname); sequence.Items.Add(homephone); sequence.Items.Add(notes); employeetype.Particle = sequence;
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