When you create a markup language, what do your parent elementsmean? Wha
Hi Folks, How do you define a parent element and its children? The Geography Markup Language (GML) defines a parent element as corresponding to a real-world object and its children as properties of the real-world object. Thus, parent-child means object-property. For example, a Bridge is a real-world object and thus is the name of the parent element. Total-length, width, and crosses are properties of Bridge and thus are the names of its children: <?xml version="1.0" encoding="UTF-8"?> <Bridge> <total-length>_____</total-length> <width>_____</width> <crosses>_____</crosses> </Bridge> All GML applications treat a parent element as an object and its children as properties of the object. GML takes an Object-Oriented perspective on the meaning of markup. (The following discussion on XSLT may be stated better and/or more accurately; I invite your revision) XSLT takes a different perspective. XSLT takes the perspective that markup is a definition. For example, the following XSLT makes this definition: "For each cost element, c, c is greater than 0": <xsl:for-each select="//cost"> <xsl:variable name="c" select="xs:integer(.)" /> <xsl:value-of select="c > 0" /> </xsl:for-each> Each XSLT processor treats the for-each parent element as an expression of a truth (specified by its children) over the range of values indicated in the select attribute. XSLT takes a Functional perspective on the meaning of markup. Recap: here are two ways of defining the meaning of markup: 1. Object-property 2. Functional definition What other ways are there? When you create a markup language, what do your parent elements mean? What do your children elements mean? /Roger
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