[UPHPU] OT: XML Schema

[Craig Jackson]

Does anyone have a good recommendation on learning XML Schema? I am
understanding how to define data, but I am having a hard time with the
XMLSchema-instance attributes that I have seen in many tutorials (and
how it links the Schema to the xml doc).

Example 1:
<book isbn="0836217462"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:noNamespaceSchemaLocation="file:library.xsd">

Example 2:
<book isbn="0836217462"
	xmlns="http://example.org/ns/books/"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation=
	    "http://example.org/ns/books/ file:library.xsd">

I have no idea what either of these examples are doing. Anyway, does
anyone know a good online tutorial (usually, w3schools.com's tutorials
help me)? or a good book on XML Schema?

Thanks,
Craig Jackson