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34 The XML Files: Development of XML/XSL Applications Using WebSphere Studio
</BOOK>
<BOOK ID=”B3.2”>
<TITLE>great novel</TITLE>
<COPIES>10</COPIES>
</BOOK>
<BOOK ID=”B5.5”>
<TITLE>good story</TITLE>
<COPIES>10</COPIES>
</BOOK>
</LIBRARY>
The path /child::book/child::copies selects all copies element children of book,
which are defined under the document’s root. The above path can also be written
as
/book/copies.
The XPath location step makes the selection of document part based on the
basis and the predicate. The basis performs a selection based on axis name and
node test. Then the predicate performs additional selections based on the
outcome of the selection from the basis. A simple example of this is as follows:
The path
/child::book[position()-1] selects the first book element under root. This
location step can also be written as
/book[1]
For example, the path /book/author/@* would have selected all the author elements’
attributes
The path
/book/author[@type=’old’] would have selected all the author elements
with type attribute equal to “old”.
The W3C has published a working draft for a new set of requirements for XPath
on February 2001. It has set of number of goals. It has stated that XML must:
Simplify manipulation of XML Schema-types content
Simplify manipulation of string-content
Support related XML standards
Improve ease of use
Improve interoperability
Improve i18n (International Language Support)
Maintain backward compatibility
Enable improved processor efficiency
2.7 XML digital
Any document, XML or otherwise, can be encrypted entirely and be transmitted
to one or more recipients. Suppose we would only want to encrypt parts of the