By Aaron Skonnard
This is often, because the name indicates, and crucial reference publication for XML. subject matters from newbie to complicated are coated. Do observe although, do not be fooled through the whimsical hide, this publication is *dry*. it is not precisely a read-through kind of e-book until you are simply particularly stoked approximately realizing every little thing it has to supply approximately XML. i might recommended scanning the desk of contents, perhaps interpreting a number of the bankruptcy or part intros to get yourself up to speed with the know-how and the way all of it interrelates after which utilizing it as a reference in the event you have to get whatever performed and feature simply forgotten how.
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Extra info for Essential XML Quick Reference: A Programmer's Reference to XML, XPath, XSLT, XML Schema, SOAP, and More
Description A location step identifies a new node-set relative to the context node-set. The location step is evaluated against each node in the context node-set, and the union of the resulting node-sets becomes the context node-set for the next step. Location steps consist of an axis identifier, a node test, and zero or more predicates (see Figure 3–4). For more information on axes, node tests, and predicates, see the following sections. >100]/child::text() location step location step XPath location step Figure 3–4 Location step syntax.
If the character value is represented in hexadecimal form, then it must be preceded by an x. Character references end with ;. Character references can only be used for attribute and element content. Nonrepresentable characters appearing as part of element or attribute names or as part of processing instructions or comments cannot be written using character references; rather, a more suitable encoding must be used instead. 12 Well-formed XML All XML must be well formed. A well-formed XML document is one in which, in addition to all the constructs being syntactically correct, there is exactly one toplevel element, all open tags have a corresponding close tag or use the empty element shorthand syntax, and all tags are correctly nested (that is, close tags do not overlap).
Note that although the syntax for external entities only shows using a system identifier, public identifiers may also be used as shown in Figure 2–2. ENTITY name SYSTEM "systemId" NDATA nname> Unparsed The previous syntax is for declaring entities. Once an entity has been declared, it can be used in either the DTD (parameter) or the XML document (general) through an entity reference. ENTITY % name "value"> Description Internal parameter entities are used to parameterize portions of the DTD (for example, other declarations) or they can contain one or more complete declarations.