An XML schema uses vocabulary defined by the schema for schemas to create a collection of XML Schema type definitions and element declarations that comprise a vocabulary for describing the contents and structure of a new class of XML documents, the XML instance documents that conform to that XML schema.
Note: This manual uses the term "XML schema" (lower-case "s") to reference any XML schema that conforms to the W3C XML Schema (upper-case "S") Recommendation.
Oracle XML DB is included as part of Oracle Database starting with Oracle9 Oracle XML DB functionality is partially based on the Oracle XML Developer's Kit C implementations of the relevant XML standards, such as XML Parser, XSLT Virtual Machine, XML DOM, and XML Schema Validator.
Oracle XML DB supports all major XML, SQL, Java, and Internet standards.
For binary XML storage, Secure Files is the default storage option.
Support for the Worldwide Web Consortium (W3C) XML Schema Recommendation is a key feature in Oracle XML DB.
Figure 1-1 presents an overview of the standards supported by Oracle XML DB.
With Oracle XML DB, you can store and manage data that is structured, unstructured, and semi-structured using a standard data model and standard SQL and XML.
tables or columns to conform to an XML schema, in which case the database ensures that only XML data that validates against the XML schema is stored in the column or table. storage from one model to another using database import/export. You can change XML storage options when tuning your application.Java allows you to play online games, chat with people around the world, calculate your mortgage interest, and view images in 3D, just to name a few.Java software for your computer, or the Java Runtime Environment, is also referred to as the Java Runtime, Runtime Environment, Runtime, JRE, Java Virtual Machine, Virtual Machine, Java VM, JVM, VM, Java plug-in, Java plugin, Java add-on or Java download.Oracle Database provides database capabilities for working with XML: indexing and search; updates and transaction processing; managing relationships using constraints; multiple data views; high performance and scalability. Oracle XML DB presents a symmetric, dual view of data: as XML and as relational.A key feature of Oracle XML DB is that it lets you work with XML data as if it were relational data and relational data as if it were XML data.Oracle XML DB is a set of Oracle Database technologies related to high-performance handling of XML data: storing, generating, accessing, searching, validating, transforming, evolving, and indexing.It provides native XML support by encompassing both the SQL and XML data models in an interoperable way.These features can provide simple solutions to common business problems: views provide a way for you to wrap existing relational or object-relational data in XML format.This can be especially useful if your legacy data is not in XML format but you must migrate it to XML format.These are the major performance features of Oracle XML DB: Oracle XML DB provides standard database features such as transaction control, data integrity, replication, reliability, availability, security, and scalability, while also allowing for efficient indexing, querying, updating, and searching of XML documents in an XML-centric manner.The hierarchical nature of XML presents a traditional relational database with some challenges: Oracle XML DB addresses these challenges by introducing SQL functions and methods that allow the use of XML-centric metaphors, such as XQuery and XPath expressions for querying and updating XML Documents.