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doc/tutorial/xmltutorial.xml doc/tutorial/ar01s07.html

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Wed Jun 12 21:26:08 MDT 2002 John Fleck <jfleck@inkstain.net>

	* doc/tutorial/xmltutorial.xml
	* doc/tutorial/ar01s07.html
	* doc/tutorial/ape.html
	* doc/tutorial/includegetattribute.c
	adding section to tutorial about retrieving an attribute
	value
This commit is contained in:
MDT 2002 John Fleck
2002-06-13 03:30:26 +00:00
committed by John Fleck
parent f5582f156c
commit 54520837ad
9 changed files with 254 additions and 21 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
Wed Jun 12 21:26:08 MDT 2002 John Fleck <jfleck@inkstain.net>
* doc/tutorial/xmltutorial.xml
* doc/tutorial/ar01s07.html
* doc/tutorial/ape.html
* doc/tutorial/includegetattribute.c
adding section to tutorial about retrieving an attribute
value
Tue Jun 11 12:07:04 CEST 2002 Daniel Veillard <daniel@veillard.com> Tue Jun 11 12:07:04 CEST 2002 Daniel Veillard <daniel@veillard.com>
* parser.c: applied a couple of patches from Peter Jacobi to start * parser.c: applied a couple of patches from Peter Jacobi to start

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head><meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"><title>A. Sample Document</title><meta name="generator" content="DocBook XSL Stylesheets V1.48"><link rel="home" href="index.html" title="Libxml Tutorial"><link rel="up" href="index.html" title="Libxml Tutorial"><link rel="previous" href="ar01s06.html" title="Writing Attribute"><link rel="next" href="apb.html" title="B. Code for Keyword Example"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">A. Sample Document</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ar01s06.html">Prev</a><EFBFBD></td><th width="60%" align="center"><EFBFBD></th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="apb.html">Next</a></td></tr></table><hr></div><div class="appendix"><h2 class="title" style="clear: both"><a name="sampledoc"></a>A. Sample Document</h2><pre class="programlisting"> <html><head><meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"><title>A. Sample Document</title><meta name="generator" content="DocBook XSL Stylesheets V1.48"><link rel="home" href="index.html" title="Libxml Tutorial"><link rel="up" href="index.html" title="Libxml Tutorial"><link rel="previous" href="ar01s07.html" title="Retrieving Attributes"><link rel="next" href="apb.html" title="B. Code for Keyword Example"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">A. Sample Document</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ar01s07.html">Prev</a><EFBFBD></td><th width="60%" align="center"><EFBFBD></th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="apb.html">Next</a></td></tr></table><hr></div><div class="appendix"><h2 class="title" style="clear: both"><a name="sampledoc"></a>A. Sample Document</h2><pre class="programlisting">
&lt;?xml version=&quot;1.0&quot;?&gt; &lt;?xml version=&quot;1.0&quot;?&gt;
&lt;story&gt; &lt;story&gt;
&lt;storyinfo&gt; &lt;storyinfo&gt;
@ -12,4 +12,4 @@
&lt;para&gt;This is the body text.&lt;/para&gt; &lt;para&gt;This is the body text.&lt;/para&gt;
&lt;/body&gt; &lt;/body&gt;
&lt;/story&gt; &lt;/story&gt;
</pre></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ar01s06.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="apb.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Writing Attribute<74></td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD>B. Code for Keyword Example</td></tr></table></div></body></html> </pre></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ar01s07.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="apb.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Retrieving Attributes<EFBFBD></td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD>B. Code for Keyword Example</td></tr></table></div></body></html>

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head><meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"><title>D. Code for Add Attribute Example</title><meta name="generator" content="DocBook XSL Stylesheets V1.48"><link rel="home" href="index.html" title="Libxml Tutorial"><link rel="up" href="index.html" title="Libxml Tutorial"><link rel="previous" href="apc.html" title="C. Code for Add Keyword Example"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">D. Code for Add Attribute Example</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="apc.html">Prev</a><EFBFBD></td><th width="60%" align="center"><EFBFBD></th><td width="20%" align="right"><EFBFBD></td></tr></table><hr></div><div class="appendix"><h2 class="title" style="clear: both"><a name="addattributeappendix"></a>D. Code for Add Attribute Example</h2><p> <html><head><meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"><title>D. Code for Add Attribute Example</title><meta name="generator" content="DocBook XSL Stylesheets V1.48"><link rel="home" href="index.html" title="Libxml Tutorial"><link rel="up" href="index.html" title="Libxml Tutorial"><link rel="previous" href="apc.html" title="C. Code for Add Keyword Example"><link rel="next" href="ape.html" title="E. Code for Retrieving Attribute Value Example"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">D. Code for Add Attribute Example</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="apc.html">Prev</a><EFBFBD></td><th width="60%" align="center"><EFBFBD></th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="ape.html">Next</a></td></tr></table><hr></div><div class="appendix"><h2 class="title" style="clear: both"><a name="addattributeappendix"></a>D. Code for Add Attribute Example</h2><p>
<pre class="programlisting"> <pre class="programlisting">
#include &lt;stdio.h&gt; #include &lt;stdio.h&gt;
#include &lt;string.h&gt; #include &lt;string.h&gt;
@ -64,4 +64,4 @@ main(int argc, char **argv) {
} }
</pre> </pre>
</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="apc.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"><EFBFBD></td></tr><tr><td width="40%" align="left" valign="top">C. Code for Add Keyword Example<6C></td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD></td></tr></table></div></body></html> </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="apc.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="ape.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">C. Code for Add Keyword Example<6C></td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD>E. Code for Retrieving Attribute Value Example</td></tr></table></div></body></html>

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head><meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"><title>E. Code for Retrieving Attribute Value Example</title><meta name="generator" content="DocBook XSL Stylesheets V1.48"><link rel="home" href="index.html" title="Libxml Tutorial"><link rel="up" href="index.html" title="Libxml Tutorial"><link rel="previous" href="apd.html" title="D. Code for Add Attribute Example"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">E. Code for Retrieving Attribute Value Example</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="apd.html">Prev</a><EFBFBD></td><th width="60%" align="center"><EFBFBD></th><td width="20%" align="right"><EFBFBD></td></tr></table><hr></div><div class="appendix"><h2 class="title" style="clear: both"><a name="getattributeappendix"></a>E. Code for Retrieving Attribute Value Example</h2><p>
<pre class="programlisting">
#include &lt;stdio.h&gt;
#include &lt;string.h&gt;
#include &lt;stdlib.h&gt;
#include &lt;libxml/xmlmemory.h&gt;
#include &lt;libxml/parser.h&gt;
void
getReference (xmlDocPtr doc, xmlNodePtr cur) {
cur = cur-&gt;xmlChildrenNode;
while (cur != NULL) {
if ((!xmlStrcmp(cur-&gt;name, (const xmlChar *)&quot;reference&quot;))) {
printf(&quot;uri: %s\n&quot;, xmlGetProp(cur, &quot;uri&quot;));
}
cur = cur-&gt;next;
}
return;
}
void
parseDoc(char *docname) {
xmlDocPtr doc;
xmlNodePtr cur;
doc = xmlParseFile(docname);
if (doc == NULL ) {
fprintf(stderr,&quot;Document not parsed successfully. \n&quot;);
return;
}
cur = xmlDocGetRootElement(doc);
if (cur == NULL) {
fprintf(stderr,&quot;empty document\n&quot;);
xmlFreeDoc(doc);
return;
}
if (xmlStrcmp(cur-&gt;name, (const xmlChar *) &quot;story&quot;)) {
fprintf(stderr,&quot;document of the wrong type, root node != story&quot;);
xmlFreeDoc(doc);
return;
}
getReference (doc, cur);
return;
}
int
main(int argc, char **argv) {
char *docname;
if (argc &lt;= 1) {
printf(&quot;Usage: %s docname\n&quot;, argv[0]);
return(0);
}
docname = argv[1];
parseDoc (docname);
return (1);
}
</pre>
</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="apd.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"><EFBFBD></td></tr><tr><td width="40%" align="left" valign="top">D. Code for Add Attribute Example<6C></td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD></td></tr></table></div></body></html>

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head><meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"><title>Writing Attribute</title><meta name="generator" content="DocBook XSL Stylesheets V1.48"><link rel="home" href="index.html" title="Libxml Tutorial"><link rel="up" href="index.html" title="Libxml Tutorial"><link rel="previous" href="ar01s05.html" title="Writing element content"><link rel="next" href="apa.html" title="A. Sample Document"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Writing Attribute</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ar01s05.html">Prev</a><EFBFBD></td><th width="60%" align="center"><EFBFBD></th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="apa.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><h2 class="title" style="clear: both"><a name="xmltutorialwritingattribute"></a>Writing Attribute</h2></div></div><p>Writing an attribute is similar to writing text to a new element. In <html><head><meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"><title>Writing Attribute</title><meta name="generator" content="DocBook XSL Stylesheets V1.48"><link rel="home" href="index.html" title="Libxml Tutorial"><link rel="up" href="index.html" title="Libxml Tutorial"><link rel="previous" href="ar01s05.html" title="Writing element content"><link rel="next" href="ar01s07.html" title="Retrieving Attributes"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Writing Attribute</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ar01s05.html">Prev</a><EFBFBD></td><th width="60%" align="center"><EFBFBD></th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="ar01s07.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><h2 class="title" style="clear: both"><a name="xmltutorialwritingattribute"></a>Writing Attribute</h2></div></div><p>Writing an attribute is similar to writing text to a new element. In
this case, we'll add a reference URI to our this case, we'll add a reference URI to our
document. Full code:<a href="apd.html" title="D. Code for Add Attribute Example">Appendix D</a>.</p><p> document. Full code:<a href="apd.html" title="D. Code for Add Attribute Example">Appendix D</a>.</p><p>
A <tt class="sgmltag-element">reference</tt> is a child of the <tt class="sgmltag-element">story</tt> A <tt class="sgmltag-element">reference</tt> is a child of the <tt class="sgmltag-element">story</tt>
@ -27,4 +27,4 @@
<div class="calloutlist"><table border="0" summary="Callout list"><tr><td width="5%" valign="top" align="left"><a href="#addreferencenode"><img src="images/callouts/1.png" alt="1" border="0"></a> </td><td valign="top" align="left"><p>First we add a new node at the location of the current node <div class="calloutlist"><table border="0" summary="Callout list"><tr><td width="5%" valign="top" align="left"><a href="#addreferencenode"><img src="images/callouts/1.png" alt="1" border="0"></a> </td><td valign="top" align="left"><p>First we add a new node at the location of the current node
pointer, <tt>cur.</tt> using the <a href="http://xmlsoft.org/html/libxml-tree.html#XMLNEWTEXTCHILD" target="_top">xmlNewTextChild</a> function.</p></td></tr></table></div> pointer, <tt>cur.</tt> using the <a href="http://xmlsoft.org/html/libxml-tree.html#XMLNEWTEXTCHILD" target="_top">xmlNewTextChild</a> function.</p></td></tr></table></div>
</p><p>Once the node is added, the file is written to disk just as in the </p><p>Once the node is added, the file is written to disk just as in the
previous example in which we added an element with text content.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ar01s05.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="apa.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Writing element content<6E></td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD>A. Sample Document</td></tr></table></div></body></html> previous example in which we added an element with text content.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ar01s05.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="ar01s07.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Writing element content<6E></td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD>Retrieving Attributes</td></tr></table></div></body></html>

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head><meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"><title>Retrieving Attributes</title><meta name="generator" content="DocBook XSL Stylesheets V1.48"><link rel="home" href="index.html" title="Libxml Tutorial"><link rel="up" href="index.html" title="Libxml Tutorial"><link rel="previous" href="ar01s06.html" title="Writing Attribute"><link rel="next" href="apa.html" title="A. Sample Document"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Retrieving Attributes</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ar01s06.html">Prev</a><EFBFBD></td><th width="60%" align="center"><EFBFBD></th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="apa.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><h2 class="title" style="clear: both"><a name="xmltutorialattribute"></a>Retrieving Attributes</h2></div></div><p>Retrieving the value of an attribute is similar to the previous
example in which we retrieved a node's text contents. In this case we'll
extract the value of the URI we added in the previous
section. Full code: <a href="ape.html" title="E. Code for Retrieving Attribute Value Example">Appendix E</a>.</p><p>
The initial steps for this example are similar to the previous ones: parse
the doc, find the element you are interested in, then enter a function to
carry out the specific task required. In this case, we call
<tt>getReference</tt>:
<pre class="programlisting">
void
getReference (xmlDocPtr doc, xmlNodePtr cur) {
cur = cur-&gt;xmlChildrenNode;
while (cur != NULL) {
if ((!xmlStrcmp(cur-&gt;name, (const xmlChar *)&quot;reference&quot;))) {
<a name="getattributevalue"></a><img src="images/callouts/1.png" alt="1" border="0"> printf(&quot;uri: %s\n&quot;, xmlGetProp(cur, &quot;uri&quot;));
}
cur = cur-&gt;next;
}
return;
}
</pre>
<div class="calloutlist"><table border="0" summary="Callout list"><tr><td width="5%" valign="top" align="left"><a href="#getattributevalue"><img src="images/callouts/1.png" alt="1" border="0"></a> </td><td valign="top" align="left"><p>
The key function is <tt><a href="http://xmlsoft.org/html/libxml-tree.html#XMLGETPROP" target="_top">xmlGetProp</a></tt>, which returns an
<tt>xmlChar</tt> containing the attribute's value. In this case,
we just print it out.
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
If you are using a DTD that declares a fixed or
default value for the attribute, this function will retrieve it.
</p></div>
</p></td></tr></table></div>
</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ar01s06.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="apa.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Writing Attribute<74></td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD>A. Sample Document</td></tr></table></div></body></html>

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<![CDATA[
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
void
getReference (xmlDocPtr doc, xmlNodePtr cur) {
cur = cur->xmlChildrenNode;
while (cur != NULL) {
if ((!xmlStrcmp(cur->name, (const xmlChar *)"reference"))) {
printf("uri: %s\n", xmlGetProp(cur, "uri"));
}
cur = cur->next;
}
return;
}
void
parseDoc(char *docname) {
xmlDocPtr doc;
xmlNodePtr cur;
doc = xmlParseFile(docname);
if (doc == NULL ) {
fprintf(stderr,"Document not parsed successfully. \n");
return;
}
cur = xmlDocGetRootElement(doc);
if (cur == NULL) {
fprintf(stderr,"empty document\n");
xmlFreeDoc(doc);
return;
}
if (xmlStrcmp(cur->name, (const xmlChar *) "story")) {
fprintf(stderr,"document of the wrong type, root node != story");
xmlFreeDoc(doc);
return;
}
getReference (doc, cur);
return;
}
int
main(int argc, char **argv) {
char *docname;
if (argc <= 1) {
printf("Usage: %s docname\n", argv[0]);
return(0);
}
docname = argv[1];
parseDoc (docname);
return (1);
}
]]>

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head><meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"><title>Libxml Tutorial</title><meta name="generator" content="DocBook XSL Stylesheets V1.48"><link rel="home" href="index.html" title="Libxml Tutorial"><link rel="next" href="ar01s02.html" title="Data Types"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Libxml Tutorial</th></tr><tr><td width="20%" align="left"><EFBFBD></td><th width="60%" align="center"><EFBFBD></th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="ar01s02.html">Next</a></td></tr></table><hr></div><div class="article"><div class="titlepage"><div><h1 class="title"><a name="id2759085"></a>Libxml Tutorial</h1></div><div><h3 class="author">John Fleck</h3></div><div><p class="copyright">Copyright <20> 2002 John Fleck</p></div><div><div class="revhistory"><table border="1" width="100%" summary="Revision history"><tr><th align="left" valign="top" colspan="2"><b>Revision History</b></th></tr><tr><td align="left">Revision 1</td><td align="left">June 4,2002</td></tr></table></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><a href="index.html#introduction">Introduction</a></dt><dt><a href="ar01s02.html">Data Types</a></dt><dt><a href="ar01s03.html">Parsing the file</a></dt><dt><a href="ar01s04.html">Retrieving Element Content</a></dt><dt><a href="ar01s05.html">Writing element content</a></dt><dt><a href="ar01s06.html">Writing Attribute</a></dt><dt>A. <a href="apa.html">Sample Document</a></dt><dt>B. <a href="apb.html">Code for Keyword Example</a></dt><dt>C. <a href="apc.html">Code for Add Keyword Example</a></dt><dt>D. <a href="apd.html">Code for Add Attribute Example</a></dt></dl></div><div class="abstract"><p><b>Abstract</b></p><p>Libxml is a freely licensed C language library for handling <html><head><meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"><title>Libxml Tutorial</title><meta name="generator" content="DocBook XSL Stylesheets V1.48"><link rel="home" href="index.html" title="Libxml Tutorial"><link rel="next" href="ar01s02.html" title="Data Types"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Libxml Tutorial</th></tr><tr><td width="20%" align="left"><EFBFBD></td><th width="60%" align="center"><EFBFBD></th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="ar01s02.html">Next</a></td></tr></table><hr></div><div class="article"><div class="titlepage"><div><h1 class="title"><a name="id2755382"></a>Libxml Tutorial</h1></div><div><h3 class="author">John Fleck</h3></div><div><p class="copyright">Copyright <20> 2002 John Fleck</p></div><div><div class="revhistory"><table border="1" width="100%" summary="Revision history"><tr><th align="left" valign="top" colspan="2"><b>Revision History</b></th></tr><tr><td align="left">Revision 1</td><td align="left">June 4,2002</td></tr><tr><td align="left">Revision 2</td><td align="left">June 12, 2002</td></tr></table></div></div><hr></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><a href="index.html#introduction">Introduction</a></dt><dt><a href="ar01s02.html">Data Types</a></dt><dt><a href="ar01s03.html">Parsing the file</a></dt><dt><a href="ar01s04.html">Retrieving Element Content</a></dt><dt><a href="ar01s05.html">Writing element content</a></dt><dt><a href="ar01s06.html">Writing Attribute</a></dt><dt><a href="ar01s07.html">Retrieving Attributes</a></dt><dt>A. <a href="apa.html">Sample Document</a></dt><dt>B. <a href="apb.html">Code for Keyword Example</a></dt><dt>C. <a href="apc.html">Code for Add Keyword Example</a></dt><dt>D. <a href="apd.html">Code for Add Attribute Example</a></dt><dt>E. <a href="ape.html">Code for Retrieving Attribute Value Example</a></dt></dl></div><div class="abstract"><p><b>Abstract</b></p><p>Libxml is a freely licensed C language library for handling
XML, portable across a large number of platforms. This XML, portable across a large number of platforms. This
tutorial provides examples of its basic functions.</p></div><div class="sect1"><div class="titlepage"><div><h2 class="title" style="clear: both"><a name="introduction"></a>Introduction</h2></div></div><p>Libxml is a C language library implementing functions for reading, tutorial provides examples of its basic functions.</p></div><div class="sect1"><div class="titlepage"><div><h2 class="title" style="clear: both"><a name="introduction"></a>Introduction</h2></div></div><p>Libxml is a C language library implementing functions for reading,
creating and manipulating XML data. This tutorial creating and manipulating XML data. This tutorial
@ -11,6 +11,5 @@
</p><p>The tutorial is based on a simple XML application I </p><p>The tutorial is based on a simple XML application I
use for articles I write. The format includes metadata and the body use for articles I write. The format includes metadata and the body
of the article.</p><p>The example code in this tutorial demonstrates how to: of the article.</p><p>The example code in this tutorial demonstrates how to:
<div class="itemizedlist"><ul type="disc"><li><p>Parse the document.</p></li><li><p>Extract the text within a specified element.</p></li><li><p>Add an element and its content.</p></li><li><p>Extract the value of an attribute.</p></li><li><p>Add an attribute.</p></li></ul></div> <div class="itemizedlist"><ul type="disc"><li><p>Parse the document.</p></li><li><p>Extract the text within a specified element.</p></li><li><p>Add an element and its content.</p></li><li><p>Add an attribute.</p></li><li><p>Extract the value of an attribute.</p></li></ul></div>
</p><p>Full code for the examples is included in the appendices.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><EFBFBD></td><td width="20%" align="center"><EFBFBD></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="ar01s02.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><EFBFBD></td><td width="20%" align="center"><EFBFBD></td><td width="40%" align="right" valign="top"><EFBFBD>Data Types</td></tr></table></div></body></html> </p><p>Full code for the examples is included in the appendices.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><EFBFBD></td><td width="20%" align="center"><EFBFBD></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="ar01s02.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><EFBFBD></td><td width="20%" align="center"><EFBFBD></td><td width="40%" align="right" valign="top"><EFBFBD>Data Types</td></tr></table></div></body></html>

72
doc/tutorial/xmltutorial.xml
View File

@ -5,6 +5,7 @@
<!ENTITY STORY SYSTEM "includestory.xml"> <!ENTITY STORY SYSTEM "includestory.xml">
<!ENTITY ADDKEYWORD SYSTEM "includeaddkeyword.c"> <!ENTITY ADDKEYWORD SYSTEM "includeaddkeyword.c">
<!ENTITY ADDATTRIBUTE SYSTEM "includeaddattribute.c"> <!ENTITY ADDATTRIBUTE SYSTEM "includeaddattribute.c">
<!ENTITY GETATTRIBUTE SYSTEM "includegetattribute.c">
]> ]>
<article> <article>
<articleinfo> <articleinfo>
@ -22,6 +23,10 @@
<revnumber>1</revnumber> <revnumber>1</revnumber>
<date>June 4,2002</date> <date>June 4,2002</date>
</revision> </revision>
<revision>
<revnumber>2</revnumber>
<date>June 12, 2002</date>
</revision>
</revhistory> </revhistory>
</articleinfo> </articleinfo>
<abstract> <abstract>
@ -58,14 +63,13 @@
<listitem> <listitem>
<para>Add an element and its content.</para> <para>Add an element and its content.</para>
</listitem> </listitem>
<listitem>
<para>Add an attribute.</para>
</listitem>
<listitem> <listitem>
<para>Extract the value of an attribute.</para> <para>Extract the value of an attribute.</para>
</listitem> </listitem>
<listitem>
<para>Add an attribute.</para>
</listitem>
</itemizedlist> </itemizedlist>
</para> </para>
<para>Full code for the examples is included in the appendices.</para> <para>Full code for the examples is included in the appendices.</para>
@ -288,15 +292,7 @@ parseStory (xmlDocPtr doc, xmlNodePtr cur, char *keyword) {
the old file. The second parameter is a pointer to the xmlDoc the old file. The second parameter is a pointer to the xmlDoc
structure. Setting the third parameter equal to one ensures indenting on output. structure. Setting the third parameter equal to one ensures indenting on output.
</para> </para>
</sect1> </sect1>
<!--
<sect1 id="xmltutorialattribute">
<title>Retrieving Attributes</title>
<para>Retrieving</para>
</sect1>
-->
<sect1 id="xmltutorialwritingattribute"> <sect1 id="xmltutorialwritingattribute">
<title>Writing Attribute</title> <title>Writing Attribute</title>
@ -341,6 +337,52 @@ parseStory (xmlDocPtr doc, xmlNodePtr cur, char *keyword) {
</sect1> </sect1>
<sect1 id="xmltutorialattribute">
<title>Retrieving Attributes</title>
<para>Retrieving the value of an attribute is similar to the previous
example in which we retrieved a node's text contents. In this case we'll
extract the value of the <acronym>URI</acronym> we added in the previous
section. Full code: <xref linkend="getattributeappendix" />.</para>
<para>
The initial steps for this example are similar to the previous ones: parse
the doc, find the element you are interested in, then enter a function to
carry out the specific task required. In this case, we call
<function>getReference</function>:
<programlisting>
void
getReference (xmlDocPtr doc, xmlNodePtr cur) {
cur = cur->xmlChildrenNode;
while (cur != NULL) {
if ((!xmlStrcmp(cur->name, (const xmlChar *)"reference"))) {
<co id="getattributevalue" /> printf("uri: %s\n", xmlGetProp(cur, "uri"));
}
cur = cur->next;
}
return;
}
</programlisting>
<calloutlist>
<callout arearefs="getattributevalue">
<para>
The key function is <function><ulink
url="http://xmlsoft.org/html/libxml-tree.html#XMLGETPROP">xmlGetProp</ulink></function>, which returns an
<varname>xmlChar</varname> containing the attribute's value. In this case,
we just print it out.
<note>
<para>
If you are using a <acronym>DTD</acronym> that declares a fixed or
default value for the attribute, this function will retrieve it.
</para>
</note>
</para>
</callout>
</calloutlist>
</para>
</sect1>
<!-- <!--
<appendix id="furtherresources"> <appendix id="furtherresources">
<title>Further Resources</title> <title>Further Resources</title>
@ -369,4 +411,10 @@ parseStory (xmlDocPtr doc, xmlNodePtr cur, char *keyword) {
<programlisting>&ADDATTRIBUTE;</programlisting> <programlisting>&ADDATTRIBUTE;</programlisting>
</para> </para>
</appendix> </appendix>
<appendix id="getattributeappendix">
<title>Code for Retrieving Attribute Value Example</title>
<para>
<programlisting>&GETATTRIBUTE;</programlisting>
</para>
</appendix>
</article> </article>