linking, breaks - simple question

[C. Field]

I have just read a few books over the weekend and I am very new to this.  I
was wondering if someone could please help me out on two basic questions.
How do you get links to work in XML, and how about line breaks or spacing in
content.  I use style sheets, but I only see DIV or blocks to break up units
of content.  I want to actually have breaks in my content located in the xml
document.  Below is my simple document.  Can anybody help me out?  Thanks in
advance, and sorry for the simplicity of this question, but I am just
getting started.

C.Field


<?xml:stylesheet type="text/css" href="instr.css">
<?xml version="1.0" standalone="no"?>
<!DOCTYPE InternetClass [
<!ELEMENT InternetClass (title, section+)>
<!ELEMENT SECTION (topic,example,code+,sites+)>
<!ATTLIST SECTION area CDATA #IMPLIED>
<!ELEMENT TITLE (#PCDATA)>
<!ELEMENT TOPIC (#PCDATA)>
<!ELEMENT EXAMPLE (#PCDATA)>
<!ATTLIST EXAMPLE number CDATA #REQUIRED>
<!ELEMENT SITES (#PCDATA)>
]>



<InternetClass>
<TITLE>Advanced Internet Class</TITLE>


<SECTION area="javascript">
<TOPIC>Javascript</TOPIC>
<EXAMPLE>Book</EXAMPLE>
<CODE>
javascript(windows){
 x = other stuff

}

</CODE>
</SECTION>



<SECTION area="xmlStuff">
<TOPIC>XML</TOPIC>
<EXAMPLE>Book</EXAMPLE>
<SITES>http://www.xml.com/xml/pub/tools/ruwf/check.html</SITES>
<SITES>http://www.networking.ibm.com/xml/XmlValidatorForm.html</SITES>
</SECTION>


</InternetClass>




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