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<xsl:template match= /bank > <customers> <xsl:apply-templates/> </customers> </xsl:template> <xsl:template match= /customer > <customer> <xsl:value-of select= customer-name /> </customer> </xsl:template> <xsl:template match= /> Figure 1011 Applying rules recursively
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Structural recursion is a key part of XSLT Recall that elements and subelements naturally form a tree structure The idea of structural recursion is this: When a template matches an element in the tree structure, XSLT can use structural recursion to apply template rules recursively on subtrees, instead of just outputting a value It applies rules recursively by the xsl:apply-templates directive, which appears inside other templates For example, the results of our previous query can be placed in a surrounding <customers> element by the addition of a rule using xsl:apply-templates, as in Figure 1011 The new rule matches the outer bank tag, and constructs a result document by applying all other templates to the subtrees appearing within the bank element, but wrapping the results in the given <customers> </customers> element Without recursion forced by the <xsl:apply-templates/> clause, the template would output <customers> </customers>, and then apply the other templates on the subelements In fact, the structural recursion is critical to constructing well-formed XML documents, since XML documents must have a single top-level element containing all other elements in the document XSLT provides a feature called keys, which permit lookup of elements by using values of subelements or attributes; the goals are similar to that of the id() function in XPath, but permits attributes other than the ID attributes to be used Keys are de ned by an xsl:key directive, which has three parts, for example: <xsl:key name= acctno match= account use= account-number /> The name attribute is used to distinguish different keys The match attribute speci es which nodes the key applies to Finally, the use attribute speci es the expression to be used as the value of the key Note that the expression need not be unique to an element; that is, more than one element may have the same expression value In the example, the key named acctno speci es that the account-number subelement of account should be used as a key for that account Keys can be subsequently used in templates as part of any pattern through the key function This function takes the name of the key and a value, and returns the
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Querying and Transformation
<xsl:key name= acctno match= account use= account-number /> <xsl:key name= custno match= customer use= customer-name /> <xsl:template match= depositor > <cust-acct> <xsl:value-of select=key( custno , customer-name )/> <xsl:value-of select=key( acctno , account-number )/> </cust-acct> </xsl:template> <xsl:template match= /> Figure 1012 Joins in XSLT
set of nodes that match that value Thus, the XML node for account A-401 can be referenced as key( acctno , A-401 ) Keys can be used to implement some types of joins, as in Figure 1012 The code in the gure can be applied to XML data in the format in Figure 101 Here, the key function joins the depositor elements with matching customer and account elements The result of the query consists of pairs of customer and account elements enclosed within cust-acct elements XSLT allows nodes to be sorted A simple example shows how xsl:sort would be used in our style sheet to return customer elements sorted by name: <xsl:template match= /bank > <xsl:apply-templates select= customer > <xsl:sort select= customer-name /> </xsl:apply-templates> </xsl:template> <xsl:template match= customer > <customer> <xsl:value-of select= customer-name /> <xsl:value-of select= customer-street /> <xsl:value-of select= customer-city /> </customer> </xsl:template> <xsl:template match= /> Here, the xsl:apply-template has a select attribute, which constrains it to be applied only on customer subelements The xsl:sort directive within the xsl:apply-template element causes nodes to be sorted before they are processed by the next set of templates Options exist to allow sorting on multiple subelements/attributes, by numeric value, and in descending order
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