OMG: Common Warehouse Metamodel Specifications, Version 1.0, Oct. 2001, http:// www.omg.org/. Home/Search Document Not in Database Summary Related Articles Check |
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Introducing Custom Language Extensions to SQL:1999 - Kovse, Mahnke (2003) (Correct)
.... an extended metamodel to organize the constructs defined in imported extension packages and thereby available in XSQL (including those already provided by SQL:1999) Instead of building the SQL:1999 part of the metamodel from scratch, we decided to use the OMG s Common Warehouse Metamodel (CWM) [18]. CWM is a metamodel based on Meta Object Facility (MOF) 16] designed to enable easy interchange of warehouse and business intelligence metadata between warehouse tools, warehouse platforms and warehouse metadata repositories. Choosing an already present and accepted OMG metamodel, the users of ....
OMG: Common Warehouse Metamodel Specifications, Version 1.0, Oct. 2001, http:// www.omg.org/.
Introducing Custom Language Extensions to SQL:1999 - Kovse, Mahnke (2003) (Correct)
....of real world problems (see [14] for examples) and promotes code reuse to the extent otherwise difficult to achieve. An obvious problem caused by the lack of multiple inheritance in SQL:1999 is that even some standardized metamodels defined using multiple inheritance (e.g. OMG s UML metamodel [17]) cannot be directly mapped onto type and table hierarchies in database schemas. Zhang [24] notes that current object relational databases fail to support relationships that contain extended semantics. As a solution, she proposes an extension to SQL called Orient SQL to allow precise ....
OMG: Unified Modeling Language Specification, Version 1.4, Sept. 2001, http:// www.omg.org/.
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