For details on tools for integrating XML documents into database applications, see Chapter 32, "Using XML in database applications. Note In addition to the tools described in this chapter, Delphi comes with tools and components for converting XML documents to data packets that integrate into the Delphi database architecture. These tools use a DOM parser that is provided by another vendor, and make it even easier to work with XML documents. A number of vendors provide XML parsers that implement the DOM interfaces to let you interpret and edit XML documents more easily.ĭelphi provides a number of additional tools for working with XML documents. W3C defines a set of standard interfaces for representing a parsed XML document called the Document Object Model (DOM). Those four child nodes would act as leaf nodes.
#Delphi xml iterate nodes how to
Some of the tags (the and tags) include attributes, which are Name=Value pairs that provide details on how to interpret the tag.Īlthough it is possible to work directly with the text in an XML document, typically applications use additional tools for parsing and editing the data. Each of these two child nodes would have four child nodes of its own (name, price, symbol, and shares). Each node in this hierarchy contains either a set of child nodes, or a text value. The remaining lines are organized into a hierarchy with a single root node (the tag). Other types of files that describe the structure of an XML document include Reduced XML Data (XDR) and XML schemas (XSD). (Delphi DLL) Access an Inner Node of an XML Document Demonstrates how to navigate to a particular inner node of an XML document. In this case, the structure is defined in an external file, rather than in the XML document itself. The DTD in this example references another file (sth.dtd). It imposes syntax rules on the elements (tags) contained in the document. The DTD is how XML defines the structure of the document. The second line, which begins with the tag, is a document type declaration (DTD). In this example, the XML declaration says that the document conforms to version 1.0 of the XML specification, that it uses UTF-8 character encoding, and that it relies on an external file for its document type declaration (DTD). The XML declaration is optional but you should include it, because it supplies useful information about the document. The first line is a processing instruction called an XML declaration. This example illustrates a number of typical elements in an XML document.
Tags in the XML document describe the role or meaning of each data element, as illustrated in the following document, which describes a collection of stock holdings: XML documents provide a hierarchical view of a body of data. Discussion: How to iterate (too old to reply) Alejandro Castro 04:20:08 UTC. They are often used as a standard, transportable format for data in Web applications, business-to-business communication, and so on. XML documents provide a simple, text-based way to store information so that it is easily searched or edited.
It is similar to HTML, except that the tags describe the structure of information rather than its display characteristics. XML (Extensible Markup Language) is a markup language for describing structured data.
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