Building Blocks of Markup Languages in VS .NET

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Building Blocks of Markup Languages
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The syntax of markup languages such as SGML, HTML, and XML is based on tags, elements, and attributes. A tag is a markup language building block that consists of delimiters (angled brackets) and the text between them:
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An element is a markup language part that consists of a pair of tags and the text between them:
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<TITLE>SQL Server 2000 Stored Procedure Programming</TITLE>
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13: Introduction to XML for Database Developers
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Each element has an opening tag and a closing tag. The text between these tags is called the content of the element. An attribute is a component in the form of a name/value pair that delimits a tag:
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Okay, suppose you have created a document and have marked up some parts of it. Now what You can share it with others. They will use something called a user agent to review the document. In a broader context, a user agent could be a travel agent that helps a customer buy tickets for a trip. However, in the IT industry, a user agent is a program that understands the markup language and presents information to an end user. An example of such a program is a web browser designed to present documents created using HTML.
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XML Elements and Attributes
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The following is a simple example of an XML document:
<Inventory> <Asset Inventoryid="5"> <Equipment>Toshiba Portege 7020CT</Equipment> <EquipmentType>Notebook</EquipmentType> <LocationId>2</LocationId> <StatusId>1</StatusId> <LeaseId>1234</LeaseId> <LeaseScheduleId>1414</LeaseScheduleId> <OwnerId>83749271</OwnerId> <Cost>6295.00</Cost> <AcquisitionType>Lease</AcquisitionType> </Asset> </Inventory>
An XML document must contain one or more elements. One of the elements is not part of any other element and therefore is called the document s root element. It must be uniquely named. In the preceding example, the root element is named Inventory. Each element can, in turn, contain one or more elements. In the preceding example, the Inventory element contains one Asset element. The Asset element also contains other elements (Equipment, EquipmentType, and so on). The Equipment element contains just its content the text string "Toshiba Portege 7020CT." Unlike HTML, XML is case sensitive. Therefore, Asset, asset, and ASSET would represent different elements.
SQL Server 2000 Stored Procedure & XML Programming
It is possible to define an empty element. Such elements can be displayed using standard opening and closing tags:
<Inventory></Inventory>
or using special notation:
<Inventory/>
If an element contains attributes but no content, an empty element is an efficient way to write it:
<Asset Inventoryid="5"/>
An element can have more than one attribute. The following example shows an empty element that contains nine attributes:
<Asset Inventoryid="12" EquipmentId="1" LocationId="2" StatusId="1" LeaseId="1" LeaseScheduleId="1" OwnerId="1" Lease="100.0000" AcquisitionTypeID="2"/>
You are not allowed to repeat an attribute in the same tag. The following example shows a syntactically incorrect element:
<Inventory Inventoryid="12" Inventoryid="13"/>
Processing Instructions
An XML document often starts with a tag that is called a processing instruction. For example, the following processing instruction notifies the reader that the document it belongs to is written in XML that complies with version 1.0:
< xml version="1.0" >
A processing instruction has the following format:
< name data >
The name portion identifies the processing instruction to the application that is processing the XML document. Names must start with xml. The data portion that follows is optional and includes information that may be used by the application.
13: Introduction to XML for Database Developers
Although it is not required, it is recommended that you start an XML document with a processing instruction that explicitly identifies that document as an XML document defined using a specified version of the standard.
Document Type Definition
As mentioned earlier, markups are meaningless if defining rules for the following is not possible: What constitutes a markup What a markup means A Document Type Definition (DTD) is a type of document that is often used to define such rules for XML documents. The DTD contains descriptions and constraints (naturally, not Transact-SQL constraints) for each element (such as the order of element attributes and membership). User agents can use the DTD file to verify that an XML document complies with its rules. The DTD can be an external file that is referenced by an XML document:
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