Is
XML a database? XML
document is a collection of data. In other words it doesn’t make much difference
between the other files that store data. A XML in a database format is a self
describing, portable, and can describe data in tree or graph structure. XML is
a sort of Database Management System (DBMS).
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XML
provides storage, schemas, query languages, programming interfaces and so on .It
lacks in triggers, queries, multi-user access that a real database constitutes.
The main advantage of XML is that the data is portable and it allows you to have
nested entries. XML
allows you to preserve physical document structure, supports document level transactions
and execute queries in an XML query language. Mapping
the XML document schema to the database schema does the transfer of data between
XML documents and a database. Mappings between document schemas and database schemas
are performed on attributes and text. There are 2 mappings that are generally
used to map on XML document schema to the database schema: I)
TABLE BASED MAPPING
ii) OBJECT RELATIONAL MAPPING Native
XML databases are designed especially to store XML documents .It is always possible
to store data in XML documents in a native XML database. This is done so, when
your data is semi-structured. Although, this kind of data can be stored in object
oriented and hierarchical databases, it is always better to store it in a native
XML database. It enables us to retrieve data much faster than a relational database.
One more reason is to store data in a native XML database is to exploit XML specification
capabilities, such as executing XML queries.
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