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CREATE TABLE xml_tab( id INT primary key, xml_col XML) In addition, columns, variables, and parameters of the XML data type can be constrained by an XML schema. XML schemas are defined in the SQL Server catalog. XML, like relational databases, has its own query language optimized for the data format. Since XML data is hierarchical, it’s reminiscent of a hierarchical file system. The archetypical query language for XML documents is known as XPath. Queries in XPath reflect the hierarchical nature of XML, since nodesets are selected by using syntax similar to that used to specify files in the UNIX file system.

NET would be directly accessible as a language for stored procedures and user-defined functions. I could use object-oriented programming techniques with my database programming as well. This might be a big assist to the procedural programming in T-SQL I was already doing, in those cases where I needed it. I’d read about using objectoriented languages in the ANSI SQL specifications. NET classes might be available in SQL Server as types that the server knew about. I’d read the ANSI spec for that too.

95 Like a SQL query, an XPath query simply produces a resultset consisting of possibly multiple instances of items; unlike in SQL, these results are not always rectangular in shape. XPath results can consist of nodesets of any shape or even scalar values. In SQL, database vendors can implement a variation of SQL-PSM (persistent stored modules) that composes possibly multiple SQL queries and some procedural code to produce a more complex result. SQL Server’s variation of SQL-PSM is known as TransactSQL.

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