Examples of using both xml, schema, and xslt

I have never used schema before. I hope to add namespace and schema to my xml file this time, and then convert it into html using xslt. I didn't expect to spend a lot of time. Now I will record the results of my normal work and hope to help you.
Let's first look at my xml file. The menu to be used to define the webpage.
<? Xml version = "1.0" encoding = "GB2312"?>
<Menu_items>
<Menu_item href = "index.html" image = "images/A1.gif" name = "homepage"/>
<Menu_item href = "ep.html" image = "images/A2.gif" name = "news">
<Menu_item href = "ep.html" image = "images/A2.gif" name = "Chinese news"/>
</Menu_item>
</Menu_items>
A simple xml file is used to automatically Generate a Schema file using the Generate schema function of xmlspy, and then make some minor modifications. The result is as follows:
<? Xml version = "1.0" encoding = "GB2312"?>
<Xs: schema xmlns = "http://www.hz-sp.com/2005/XMLSchema-menu" xmlns: xs = "http://www.w3.org/2001/XMLSchema" targetNamespace = "http://www.hz-sp.com/2005/XMLSchema-menu">
<Xs: element name = "menu_item">
<Xs: complexType>
<Xs: sequence>
<Xs: element ref = "menu_item" minOccurs = "0"/>
</Xs: sequence>
<Xs: attribute name = "name" type = "xs: string" use = "required"/>
<Xs: attribute name = "href" type = "xs: anyURI" use = "optional"/>
<Xs: attribute name = "image" type = "xs: anyURI" use = "optional"/>