W-X

WELL-BALANCED (XML FRAGMENT INTERCHANGE)

An XML fragment is well-balanced if there is an end tag that matches every start tag. This is a less strict constraint than being well- formed : a well-balanced fragment does not have to have a single element that encloses all the others. XSLT and XPath are defined so they will work on any trees representing a well-balanced XML fragment. The XML and XSLT standards don't use this terminology; instead they refer to the rules for an external general parsed entity.

WELL-FORMED

A document is well-formed if it follows the syntax rules in the XML specification. These include the rule that there must be a single outermost element that encloses all others. The XML output of an XSLT stylesheet is not required to be well-formed, only to be well-balanced.

WHITESPACE ( XML )

Whitespace is any contiguous sequence of tab, carriage return, newline, and space characters . A whitespace node is a text node whose string value consists solely of whitespace. (The XML specification spells this as two words, white space, but I prefer a single word, because using white as a qualifying adjective suggests that white space is to be contrasted with red space and green space, which of course is not the case.)

XPATH 1.0 COMPATIBILITY MODE ( XPATH )

A mode of executing XPath 2.0 expressions that attempts to provide the maximum possible level of backwards compatibility with XPath 1.0. In XSLT, this mode is selected by specifying «version="1.0" » in the stylesheet.