XSLTForms/HelloWorld
If XSLTForms is installed correctly, the following form (or something very similar to it) should work.
<?xml-stylesheet href="xsltforms/xsltforms.xsl" type="text/xsl"?>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:xforms="http://www.w3.org/2002/01/xforms"
xmlns:my="http://www.example.com/my-data">
<head>
<!--The Model is defined within the head of the xhtml document-->
<xforms:model>
<!--The instance is defined within the model-->
<xforms:instance>
<my:data>Hello World</my:data>
</xforms:instance>
</xforms:model>
</head>
<body>
<!--The view is defined within the body of the document-->
<xforms:group>
<xforms:output ref="/my:data">
<xforms:label>Output Control Example</xforms:label>
</xforms:output>
</xforms:group>
</body>
</html>
Notes:
The form includes an xml-stylesheet processing instruction (line 1, highlighted). The value of the href pseudo-attribute should be a relative reference to the xsltforms.xsl stylesheet. The example assumes that the XSLTForms library is installed in the subdirectory xsltforms; the value of the relative reference will need to vary depending on the relative location of the library, vis-a-vis the location of the form. In another context, for example, the processing instruction might read <?xml-stylesheet href="../../../lib/xsltforms-1.0RC2/xsltforms.xsl" type="text/xsl"?>.