OS & Oracle

XQuery 1.0 is the W3C language designed for querying XML data. It is similar to SQL in many ways, but just as SQL is designed for querying structured, relational data, XQuery is designed especially for querying semistructured, XML data from a variety of data sources. You can use XQuery to query XML data wherever it [...]

SQL/XML provides a series of functions to integrate XML functionality to SQL processing,below is the list of such functions:
APPENDCHILDXML DELETEXML DEPTH EXTRACT (XML) EXISTSNODE EXTRACTVALUE INSERTCHILDXML INSERTXMLBEFORE [...]

XMLType is an abstract type for programming, whose storage model can be unstructured storage or structure storage. 
Oracle XML DB uses XML schema as a mechanism for defining how the contents of an XMLType should be stored inside the database. Currently Oracle XML DB provides two options:

Unstructured storage. The content of the [...]

The elementFormDefault can be qualified or unqualified, unqualified is the default. "qualified" means that all the local elements(such as shipTo below) must be qualified, either through specified namespace or default namespace. Example: po.xsd as:

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, “Courier New”, courier, monospace;
background-color: [...]