Applied XML Programming for Microsoft .NET.pdf - Csbdu.in

Figure 4-3: A dynamically created XML document with entities and DOCTYPE definitions.If you need to concatenate entities with plain text or if you just want to write thecontents of an attribute, use the WriteString method. For example, the following codeadds ", Europe" to the attribute Country:writer.WriteStartAttribute("Country", "");writer.WriteEntityRef("I");writer.WriteString(", Europe");writer.WriteEndAttribute();Figure 4-4 shows the results of the concatenation.Figure 4-4: The Country attribute is created by concatenating an entity reference and plaintext.As you might have noticed, the end tags for both attributes and nodes do not take anyarguments. The writer maintains an internal stack of opened attributes and nodes andautomatically pops the innermost element when you close a node. Likewise, when anew node or attribute is opened, the writer simply pushes a new element onto thestack. If the newly added element is a node, in the resulting XML code, the node isnested one additional level.At the end of the document—that is, when WriteEndDocument is called—all pendingnodes are automatically popped off the stack and closed according to the last in, firstout (LIFO) method. Let's consider what can happen if you disregard this simple rule andomit a call to WriteEndElement in a loop. The following code translates an array ofstrings into XML:126