XML allows for unbounded white space wherever white space is permitted in the XML syntax.
In the figure below, the locations where white space that’s part of the XML syntax may appear are marked with a ( Now when the XML specification says any white space, they don’t really mean it. The standards leave some aspects of white space handling up to the implementers, or at least that’s what the implementers would have us believe.
I suspect some implementers choose to ignore parts of the standards they don’t like or can’t accommodate easily in their toolsets.
Many organizations use XML to pass documents and data within the organization as well as between trading partners and vendors. The type of the current node can be checked using the supports, shown in Listing 13.1, is the optional expansion of entity references.
Due to the ubiquitous nature of these exchanges, sooner or later developers will need to read and write XML documents, transform them with XSL, and validate them using XML schemas. Simply put, an entity reference allows an XML document to be compressed by defining an entity once in a document and referencing it multiple times like so: Public Sub Validate(By Val p File Name As String, By Val p Schema As String, _ By Val p Namespace As String) Dim o Read As Xml Text Reader Dim o Valid As Xml Validating Reader Try o Read = New Xml Text Reader(p File Name) o Valid = New Xml Validating Reader(o Read) Add Handler o Valid.
NOTE In this chapter, I've assumed that you're already familiar with the basics of XML, such as elements and attributes.
If you need a refresher course on XML basics, refer to Appendix B, "XML Standards and Syntax." In this section, you'll learn how to extract information from an XML file.
That being said, you can continue to use MSXML through COM Interop, although I think you'll find that porting code that works with the DOM will be relatively simple, while rewriting code that uses SAX, the Simple API for XML introduced in MSXML 3.0, will make for a more straightforward and efficient application. Data Public Sub Extract Students(By Val p File Name As String) Dim o Read As Xml Text Reader Try Dim str FName, str LName, str Org As String o Read = New Xml Text Reader(p File Name) o Read.
namespace provides standards-based support for working with XML, this discussion will include dealing with streamed access to XML documents, manipulating XML documents with the DOM, handling XML schemas, and using XML serialization.
class to serialize or deserialize an object of the specified type.
This method also specifies a list of known types that may be present in the object graph, the maximum number of graph items to serialize, parameters to ignore unexpected data, whether to use non-standard XML constructs to preserve object reference data in the graph, and a surrogate for custom serialization.
In this article, Dan Fox discusses the support in the Services Framework for working with XML in these ways. Validation Event Handler, _ New Validation Event Handler(Address Of Validation Error) o Valid.