By Kay M.
ISBN-10: 0764577565
ISBN-13: 9780764577567
XPath 2.0 Programmer's Reference is the one authoritative reference on XPath, a sub-language inside of XSLT that determines which a part of an XML rfile the XSLT transforms. Written for pro programmers who use XML each day yet locate the W3C XPath standards difficult to slog via, this e-book explains in daily language what each build within the language does and the way to take advantage of it. It additionally bargains history fabric at the layout considering in the back of the language, light feedback of the language specification whilst applicable, and a various variety of attention-grabbing examples in quite a few program ar
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0 as a language. 0 as a Language This section attempts to draw out some of the key features of the design of the XPath language. The Syntax of XPath The XPath syntax has some unusual features, which reflect the fact that it amalgamates ideas from a number of different sources. 0 in Context «$x + 1 = round($y) mod 3». Such expressions trace their roots via programming languages such as Algol and Fortran back to the notations of elementary mathematics. ❑ Path expressions: These perform hierarchic selection of a node within a tree, an example is «/a/b//c».
Org). Both have their merits and their band of enthusiastic followers. JDOM is pleasantly easy to use but has the major drawback that it uses concrete Java classes rather than interfaces, which means there is no scope for multiple implementations to coexist. DOM4J is a much richer API, which also means it is more complex. Both share the objective of being well integrated with the Java way of doing things, and both include XPath support as a standard part of the API. org/TR/ DOM-Level-3-XPath/), which became a W3C Candidate Recommendation in March 2003.
The final outcome is a compromise, but it is a compromise that has some rationale: in particular, the language includes sufficient power to make it relationally complete, as defined by E. F. Codd in the theory of the relational model. There is a mathematical definition of this term, and achieving this property gives reasonable confidence that the language will be powerful enough for most data retrieval tasks. 0 could have gone either way. 0. If it seems like something half-way between a carefully-thought out strategy and an ad hoc ragbag, then that’s probably because it is.
XPath 2.0 Programmer’s Reference by Kay M.
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