By Michael Kay
Книга XPath 2.0: Programmer's Reference XPath 2.0: Programmer's ReferenceКниги Языки программирования Автор: Michael Kay Год издания: 2004 Формат: pdf Издат.:Wrox Страниц: 555 Размер: 54.9 ISBN: 0764569104 Язык: Английский eighty five (голосов: 1) Оценка:XPath 2.0 Programmer's Reference is the single authoritative reference on XPath, a sub-language inside XSLT that determines which a part of an XML record the XSLT transforms. Written for pro programmers who use XML on a daily basis yet locate the W3C XPath requisites difficult to slog via, this booklet explains in daily language what each build within the language does and the way to exploit it. It additionally bargains historical past fabric at the layout pondering in the back of the language, mild feedback of the language specification while acceptable, and a various variety of fascinating examples in numerous software parts.
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Extra info for XPath 2.0 programmer's reference
Both aspects of the XPath context are described in Chapter 4 of this book. A Language for Processing Sequences The striking feature of the XML data model is that the information is hierarchic. The relationship from an element to its children is intrinsically a one-to-many relationship. Moreover, the relationship is inherently ordered. Sometimes you don’t care about the order, but it’s part of the nature of XML that the order of elements is deemed to be significant. This means that when you write an expression such as «author» (which is short for «child::author», and selects all the
But the type system of XPath is something that is highly distinctive, so it deserves a place as one of the key characteristics that gives the language its flavor. I’ll be exploring the type system in depth in Chapter 3. Here, I’ll just give a few highlights, as a taste of things to come. ❑ We need to distinguish the types of the values that XPath can manipulate from the types that can appear as annotations on nodes. ❑ Atomic types can appear in both roles: You can declare an XPath variable of type integer, and you can also validate the content of an element or attribute as an integer, following which the element or attribute will be annotated with this type.