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New Addressing Schemes: URNs, URCs, and URIs
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Consider the idea of the information describing this book It may have a unique identifier for it, such as an ISBN number It has many characteristics that describe it, such as its cost,
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Appendix D:
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author, copyright, publisher, and so on Finally, the book can be found in numerous places online It may have a canonical location, but there are likely many others
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ISBN: 0-07-222942-X
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Cost: 3999 Author: Thomas A Powell Copyright: 2009
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Locations Examples
http://htmlrefcom/ http://http://wwwamazoncom/HTML-XHTML
A new set of addressing ideas addresses these generic concepts First, a uniform resource name (URN) can locate a resource by giving it a unique symbolic name rather than a unique address Second, uniform resource characteristics (URC), describes a set of attribute/value pairs that defines some aspect of an information resource For example, in the case of a book, a URC might describe a publication date, number of pages, author, and so on The form of a URC is still under discussion; however, logically what they would provide is already being used often in the form of simple <meta> tags Finally, the resource may have location(s) on the Web where it lives Taken all together, a particular information resource has been identified The collection of information, which is used to identify this document specifically, is termed a uniform resource identifier (URI)
PART III
NOTE Occasionally, URI is used interchangeably with URL Although this is acceptable, research
into the theories behind the names suggests that the term URI is more generic than URL and encompasses the ideal of an information resource Currently, a URL is the only common way to identify an information resource on the Internet Although technically a URL could be considered a URI, this confuses the issue and obscures the ultimate goal of trying to talk about information more generally than in terms of a network location
Although many of the ideas covered here are still being discussed, some existing systems already implement many of the features of URNs and URCs Furthermore, many browser vendors and large Web sites are implementing special keyword navigation schemes that mimic many of the ideas of URNs and URCs Unfortunately, as of the writing of this book, none of these approaches are widely implemented or accepted URLs are likely to remain the most common way to describe information on the Web for the foreseeable future
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APPENDIX
Reading a Document Type Definition
his appendix presents the Document Type Definitions (DTDs) for HTML 401 and XHTML 10 Traditional HTML dialects are defined using SGML (Standard Generalized Markup Language), a complex language with many nuances XHTML dialects are developed in XML (Extensible Markup Language), which is a subset of SGML and slightly easier to work with This appendix presents the small amount of SGML or XML knowledge needed to read the various DTDs found online directly
Element Type Declarations
Two common types of declarations should be familiar to Web developers: element type declarations and attribute list declarations An element type declaration defines three characteristics: 1 The element type s name, also known as its generic identifier 2 Whether start and end tags are required, are forbidden (end tags on empty elements), or may be omitted 3 The element type s content model, or what content it can enclose All element type declarations begin with the keyword ELEMENT and have the following form:
<!ELEMENT name content_model >
The declaration for the XHTML br element gives a simple example:
<!ELEMENT br EMPTY>
This case says we have a br element that contains no content at all it is empty, as shown by the keyword EMPTY
Part III:
Appendixes
In the case of traditional HTML, which is defined using SGML, we see a different syntax that defines
<!ELEMENT name minimization content_model >
In the traditional DTD, we see
<!ELEMENT BR - O EMPTY>
Here, tag minimization is declared by two parameters that indicate the start and end tags These parameters may take one of two values A hyphen indicates the tag is required An uppercase O indicates it may be omitted The combination of O for the end tag and the content model EMPTY means the end tag is forbidden Thus, under traditional HTML a <br> tag requires a start tag but not an end tag Because a <br> tag does not contain content, its content model is defined by the keyword EMPTY, just as it did in the XHTML specification
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