The format and data of XML purchase orders are well suited for Oracle XML DB storage and processing techniques because purchase orders are highly structured XML documents.

updating db via xml-28updating db via xml-87

Figure 3-1 shows a simple drag and drop operation for copying the contents of the data.

It is equivalent to the IANA registered standard UTF-8 encoding, which supports all valid XML characters.

Each entity in an XML document may use a different encoding for its characters.

Entities that are stored in an encoding other than UTF-8 or UTF-16 must begin with an XML declaration containing an encoding specification indicating the character encoding in use.

In the absence of both the encoding declaration and the BOM, the XML entity is assumed to be encoded in UTF-8.

Because ASCII is a subset of UTF-8, ASCII entities do not require an encoding declaration.Because operation, along with all of the non-virtual columns.You create a virtual column based on an XML element or attribute by defining it in terms of a SQL expression that involves that element or attribute; that is, you create a function-based column. For example, if you are sure that a given source XML document is valid, you can provide an argument to the constructor that disables the type-checking that is otherwise performed.This chapter also further explains Oracle XML DB concepts introduced in Chapter 1, "Introduction to Oracle XML DB".This chapter contains these topics: , SQL developers can leverage the power of the relational database while working in the context of XML.XML developers can leverage the power of XML standards while working in the context of a relational database. That is, individual XML elements and attributes are not mapped to individual database columns or tables.