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xslº¯Êýä¯ÀÀ XSLT supplies a number of functions. -------------------------------------------------------------------------------- XSLT Functions Name Description current() Returns the current node document() Used to access the nodes in an external XML document element-available() Tests whether the element specified is supported by the XSLT processor format-number() Converts a number into a string function-available() Tests whether the function specified is supported by the XSLT processor generate-id() Returns a string value that uniquely identifies a specified node key() Returns a node-set using the index specified by an element system-property() Returns the value of the system properties unparsed-entity-uri() Returns the URI of an unparsed entity -------------------------------------------------------------------------------- Inherited XPath Functions Node Set Functions Name Description Syntax count() ·µ»Ø½áµã¸öÊý number=count(node-set) id() Selects elements by their unique ID node-set=id(value) last() ·µ»Ø×îºóÒ»¸ö½áµãµÄÐèÒª number=last() local-name() Returns the local part of a node. A node usually consists of a prefix, a colon, followed by the local name string=local-name(node) name() ·µ»ØÒ»¸ö½áµãµÄÃû³Æ string=name(node) namespace-uri() ·µ»ØÒ»¸ö½áµãµÄÃû³Æ¿Õ¼ä uri=namespace-uri(node) position() ·µ»Ø½áµãÐòºÅ number=position() String Functions Name Description Syntax & Example concat() ·µ»ØÒ»¸ö½«N¸ö×Ö·û´®Á¬½ÓµÄÖµ string=concat(val1, val2, ..) ʾÀý: concat('The',' ','XML') ·µ»Ø½á¹û: 'The XML' contains() Èç¹ûval°üº¬substrÔò·µ»Øtrue bool=contains(val,substr) ʾÀý: contains('XML','X') ·µ»Ø½á¹û: true normalize-space() ɾ³ý¶àÓà¿Õ¸ñ string=normalize-space(string) ʾÀý: normalize-space(' The   XML ') ·µ»Ø½á¹û: 'The XML' starts-with() Èç¹ûStringÒÔsubstr¿ªÊ¼Ôò·µ»Øtrue bool=starts-with(string,substr) ʾÀý: starts-with('XML','X') ·µ»Ø½á¹û: true string() ½«Êý×Öת»»Îª×Ö·û string(value) ʾÀý: string(314) ·µ»Ø½á¹û: '314' string-length() ·µ»ØÒ»¸ö×Ö·û´®µÄ³¤¶È number=string-length(string) ʾÀý: string-length('Beatles') ·µ»Ø½á¹û: 7 substring() ½«string´Óstart¿ªÊ¼Ò»Ö±½ØÈ¡µ½µÚlengthλ string=substring(string,start,length) ʾÀý: substring('Beatles',1,4) ·µ»Ø½á¹û: 'Beat' substring-after() ½«stringÒÔsubstr·Ö¸î,Ñ¡È¡×îºóÒ»¸ö string=substring-after(string,substr) ʾÀý: substring-after('12/10','/') ·µ»Ø½á¹û: '10' substring-before() ½«stringÒÔsubstr·Ö¸î,Ñ¡È¡µÚÒ»¸ö string=substring-before(string,substr) ʾÀý: substring-before('12/10','/') ·µ»Ø½á¹û: '12' translate() ¶Ô×Ö´®½øÐÐÌæ»»²Ù×÷ string=translate(value,string1,string2) ʾÀý: translate('12:30',':','!') ·µ»Ø½á¹û: '12!30' Number Functions Name Description Syntax & Example ceiling() ·µ»ØÒ»¸öÕûÊý number=ceiling(number) ʾÀý: ceiling(3.14) ·µ»Ø½á¹û: 4 floor() ·µ»ØÒ»¸öÕûÊý number=floor(number) ʾÀý: floor(3.14) ·µ»Ø½á¹û: 3 number() ½«×Ö·ûÐÍתΪÊý×Ö number=number(value) ʾÀý: number('100') ·µ»Ø½á¹û: 100 round() ·µ»ØÒ»¸öʵÊýµÄËÄÉáÎåÈëµÄÕûÊýÖµ integer=round(number) ʾÀý: round(3.14) ·µ»Ø½á¹û: 3 sum() ·µ»Ø½áµãÖµµÄºÍ number=sum(nodeset) ʾÀý: sum(/cd/price) Boolean Functions Name Description Syntax & Example boolean() Converts the value argument to Boolean and returns true or false bool=boolean(value) false() ·µ»Øfalse false() ʾÀý: number(false()) ·µ»Ø½á¹û: 0 lang() Returns true if the language argument matches the language of the the xsl:lang element, otherwise it returns false bool=lang(language) not() Returns true if the condition argument is false, and false if the condition argument is true bool=not(condition) ʾÀý: not(false()) true() Returns true true() ʾÀý: number(true()) ·µ»Ø½á¹û: 1 -------------------------------------------------------------------------------- The current() Function -------------------------------------------------------------------------------- Definition and Usage The current() function returns a node-set that contains only the current node. Usually the current node and the context node are the same. is equal to However, there is one difference. Look at the following XPath expression: 'catalog/cd'. This expression selects the child nodes of the current node, and then it selects the child nodes of the nodes. This means that on each step of evaluation, the '.' has a different meaning. The following line: will process all cd elements that have a title attribute with value equal to the value of the current node's ref attribute. This is different from that will process all cd elements that have a title attribute and a ref attribute with the same value. -------------------------------------------------------------------------------- Syntax node-set current() Example 1              Current node:               If you have Netscape 6 or IE 5 or higher you can view: the XML file and the XSL file. View the result in Netscape 6 or IE 6 The document() Function -------------------------------------------------------------------------------- Definition and Usage The document() function is used to access nodes in an external XML document. The external XML document must be valid and parsable. One way to use this function is to look up data in an external document. For example we want to find the Celsius value from a Fahrenheit value and we refer to a document that contains some pre-computed results: -------------------------------------------------------------------------------- Syntax node-set document(object,node-set?) Parameters Parameter Description object Required. Defines an URI to an external XML document node-set Optional. Used to resolve relative URI -------------------------------------------------------------------------------- The element-available() Function -------------------------------------------------------------------------------- Definition and Usage The element-available() function returns a Boolean value that indicates whether the element specified is supported by the XSLT processor. This function can only be used to test elements that can occur in a template body. These elements are: xsl:apply-imports xsl:apply-templates xsl:attributes xsl:call-template xsl:choose xsl:comment xsl:copy xsl:copy-of xsl:element xsl:fallback xsl:for-each xsl:if xsl:message xsl:number xsl:processing instruction xsl:text xsl:value-of xsl:variable -------------------------------------------------------------------------------- Syntax boolean element-available(string) Parameters Parameter Description string Required. Specifies the element to test Example 1 xsl:comment is supported. xsl:comment is not supported. xsl:delete is supported. xsl:delete is not supported. If you have Netscape 6 or IE 5 or higher you can view: the XSL file. View the result in Netscape 6 or IE 6 -------------------------------------------------------------------------------- The format-number() Function -------------------------------------------------------------------------------- Definition and Usage The format-number() function is used to convert a number into a string. -------------------------------------------------------------------------------- Syntax string format-number(number,format,[decimalformat]) Parameters Parameter Description number Required. Specifies the number to be formatted format Required. Specifies the format pattern. Here are some of the characters used in the formatting pattern: # (Denotes a digit. ʾÀý: ####) 0 (Denotes leading and following zeros. ʾÀý: 0000.00) . (The position of the decimal point ʾÀý: ###.##) , (The group separator for thousands. ʾÀý: ###,###.##) % (Displays the number as a percentage. ʾÀý: ##%) ; (Pattern separator. The first pattern will be used for positive numbers and the second for negative numbers) decimalformat Optional. Example 1 If you have Netscape 6 or IE 5 or higher you can view: the XSL file. View the result in Netscape 6 or IE 6 The function-available() Function -------------------------------------------------------------------------------- Definition and Usage The function-available() function returns a Boolean value that indicates whether the function specified is supported by the XSLT processor. You may test the XSLT functions and the inherited XPath functions. -------------------------------------------------------------------------------- Syntax boolean function-available(string) Parameters Parameter Description string Required. Specifies the function to test Example 1 sum() is supported. sum() is not supported. current() is supported. current() is not supported. If you have Netscape 6 or IE 5 or higher you can view: the XSL file. View the result in Netscape 6 or IE 6 -------------------------------------------------------------------------------- The generate-id() Function -------------------------------------------------------------------------------- Definition and Usage The generate-id() function returns a string value that uniquely identifies a specified node. If the node-set specified is empty, an empty string is returned. If you omit the node-set parameter, it defaults to the current node. -------------------------------------------------------------------------------- Syntax string generate-id(node-set?) Parameters Parameter Description node-set Optional. Specifies on which node-set to generate a unique id   Example 1 Artists: -------------------------------------------------------------------------------- Artist: Title: Price: -------------------------------------------------------------------------------- If you have Netscape 6 or IE 5 or higher you can view: the XML file and the XSL file. View the result in Netscape 6 or IE 6 -------------------------------------------------------------------------------- The key() Function -------------------------------------------------------------------------------- Definition and Usage The key() function returns a node-set from the document, using the index specified by an element. -------------------------------------------------------------------------------- Syntax node-set key(string, object) Parameters Parameter Description string Required. Specifies the name of an xsl:key element object Required. A string to search for Example 1      Title:      Artist:      Price:    If you have Netscape 6 or IE 5 or higher you can view: the XML file and the XSL file. View the result in Netscape 6 or IE 6 -------------------------------------------------------------------------------- The system-property() Function -------------------------------------------------------------------------------- Definition and Usage The system-property() function returns the value of the system property specified by the name. System properties in the XSLT namespace: xsl:version - The version of XSLT implemented by the processor xsl:vendor - The vendor of the XSLT processor xsl:vendor-url - The URL identifying the vendor of the XSLT processor -------------------------------------------------------------------------------- Syntax object system-property(string) Parameters Parameter Description string Required. Specifies the system property to return the value of   Example 1 Version: Vendor: Vendor URL: If you have Netscape 6 or IE 5 or higher you can view: the XSL file. View the result in Netscape 6 or IE 6 -------------------------------------------------------------------------------- The unparsed-entity-uri() Function -------------------------------------------------------------------------------- Definition and Usage The unparsed-entity-uri() function returns the URI of an unparsed entity. The name of the entity must match the passed argument. If there is no such entity an empty string is returned. If the DTD contains the following declaration: the following expression: unparsed-entity-uri('pic') will return the URI for the file 'picture.jpg'. -------------------------------------------------------------------------------- Syntax string unparsed-entity-uri(string) Parameters Parameter Description string Required. Specifies the name of an unparsed entity    Êղؠ  ·ÖÏí   ¶¥(1)

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