XSL Parsing process:
When XSLT is transforming, it first traverses the XML Source Document Tree, finds the node to be processed, and then applies the defined template information to the node.
XML:
<? XML version = "1.0" encoding = "gb2312" standalone = "no"?>
<? XML: stylesheet type = "text/XSL" href = "bbs2.xsl"?>
<BBS xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi: nonamespaceschemalocation = "bbs. XSD">
<Root id = "1">
<Title> learning Java </title>
<Content> How do you learn Java? </Content>
<Sender> sunny </sender>
<Sendtime> 09-3-21 </sendtime>
<Istop> 0 </Istop>
<Isgood> 0 </isgood>
<Answer id = "1">
<Title> learning Java </title>
<Content> first, be patient and patient. </content>
<Sender> Li shengguang </sender>
<Sendtime> 09-3-21 </sendtime>
</Answer>
<Answer id = "1">
<Title> learning Java </title>
<Content> code multiple times. </content>
<Sender> LSG </sender>
<Sendtime> 09-3-21 </sendtime>
</Answer>
</Root>
<Root id = "423bda04-2aa8-4f52-af75-641718c423da">
<Title> what is JSP </title>
<Content> JSP is a Java Server Page! </Content>
<Sender> Li shengguang </sender>
<Sendtime> mon Mar 23 16:28:00 CST 2009 </sendtime>
<Istop> 0 </Istop>
<Isgood> 0 </isgood>
</Root>
<Root id = "16eb57fb-d7fa-47a3-b33e-617968bd54a2">
<Title> JAVA concept </title>
<Content> what are the three main features of Java? </Content>
<Sender> Li shengguang </sender>
<Sendtime> mon Mar 23 16:33:50 CST 2009 </sendtime>
<Istop> 0 </Istop>
<Isgood> 0 </isgood>
</Root>
<Root id = "ec30d056-074e-4af1-9148-acf4500a86c8">
<Title> JAVA is good </title>
<Content> JAVA is good </content>
<Sender> sunny </sender>
<Sendtime> Tue Mar 24 08:25:24 CST 2009 </sendtime>
<Istop> 0 </Istop>
<Isgood> 0 </isgood>
</Root>
</BBS>
The first method of XSL:
<? XML version = "1.0" encoding = "UTF-8"?>
<XSL: stylesheet xmlns: XSL = "http://www.w3.org/1999/XSL/Transform" version = "1.0">
<XSL: template match = "/">
<HTML>
<Head>
<Title> bbs. XSL </title>
</Head>
<Body>
<H2 align = "center"> Software Technology home </H2>
<Center>
<Table border = "1" width = "80%">
<Tr>
<TD width = "70%"> title </TD>
<TD width = "15%"> poster </TD>
<TD width = "15%"> posting time </TD>
</Tr>
<XSL: For-each select = "BBS/root">
<Tr>
<TD width = "60%"> <XSL: value-of select = "title"/> </TD>
<TD width = "15%"> <XSL: value-of select = "sender"/> </TD>
<TD width = "30%"> <XSL: value-of select = "sendtime"/> </TD>
</Tr>
</XSL: For-each>
</Table>
</Center>
</Body>
</Html>
</XSL: Template>
</XSL: stylesheet>
Process Analysis:
First, parse the converter to load XML to a tree in the memory form, and then start (top-down) to read the XSL file according to the <XSL: template match = "/"> Find and locate the node in the tree, and then click <XSL: template match = "/"> the content in the tag is written to the target HTML file. When a tag in the XSL namespace is encountered, the corresponding tag function is executed. If <XSL: for-each select = "BBS/root">, perform node loop matching in the XML document. Each time a corresponding node is found, the corresponding value is obtained. returns the result after the loop ends. <XSL: template match = "/"> This sentence matches the next sentence. The parsing ends because there is only one.
XSL in the second method:
<? XML version = "1.0" encoding = "UTF-8"?>
<XSL: stylesheet version = "1.0" xmlns: XSL = "http://www.w3.org/1999/XSL/Transform" xmlns: fo = "http://www.w3.org/1999/XSL/Format">
<XSL: template match = "BBS">
<HTML>
<Head>
<Title> Software Technology home </title>
</Head>
<Body>
<H2 align = "center"> Software Technology home 2 </H2>
<Center>
<Table border = "1" width = "80%">
<Tr>
<TD width = "70%"> title </TD>
<TD width = "15%"> poster </TD>
<TD width = "15%"> posting time </TD>
</Tr>
<XSL: Apply-templates select = "root"/>
</Table>
</Center>
</Body>
</Html>
</XSL: Template>
<XSL: template match = "root">
<Tr>
<TD width = "60%"> <XSL: value-of select = "title"/> </TD>
<TD width = "15%"> <XSL: value-of select = "sender"/> </TD>
<TD width = "30%"> <XSL: value-of select = "sendtime"/> </TD>
</Tr>
</XSL: Template>
</XSL: stylesheet>
Process Analysis:
First, parse the converter to load XML to a tree in the memory form, and then start (top-down) to read the XSL file according to the <XSL: template match = "BBS"> Find and locate the node in the tree. First, find the BBS node in XML and output it in the HTML file:
<HTML>
<Head>
<Title> Software Technology home </title>
</Head>
<Body>
<H2 align = "center"> Software Technology home 2 </H2>
<Center>
<Table border = "1" width = "80%">
<Tr>
<TD width = "70%"> title </TD>
<TD width = "15%"> poster </TD>
<TD width = "15%"> posting time </TD>
</Tr>
The system can see the <XSL: Apply-templates select = "root"/> indication, so it searches for the node marked as "root" in the XML source tree for matching. Like a function call, the system jumps to the "function" defined in <XSL: template match = "root"> to generate the following HTML code:
<Tr>
<TD width = "60%"> <XSL: value-of select = "title"/> </TD>
<TD width = "15%"> <XSL: value-of select = "sender"/> </TD>
<TD width = "30%"> <XSL: value-of select = "sendtime"/> </TD>
</Tr>
The parser continues to match the "root" tag in XML until the XML does not have the root tag. In this way, the code above the multi-segment can be obtained. <XSL: template match = "root"> after the matching is completed, run:
</Table>
</Center>
</Body>
</Html>
After the execution, the tag "BBS" is matched. Because the "BBS" tag only ends with one matching.
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