XML for Analysis

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XML for Analysis (XMLA) is an industry standard for data access in analytical systems, such as online analytical processing (OLAP) and data mining. XMLA is based on other industry standards such as XML, SOAP and HTTP. XMLA is maintained by XMLA Council with Microsoft, Hyperion and SAS Institute being the XMLA Council founder members.

Contents

History

The XMLA specification was first proposed by Microsoft as a successor for OLE DB for OLAP in April 2000. By January 2001 it was joined by Hyperion endorsing XMLA. The 1.0 version of the standard was released in April 2001, and in September 2001 the XMLA Council was formed. In April 2002 SAS joined Microsoft and Hyperion as founding member of XMLA Council. [1] With time, more than 25 companies joined with their support for the standard.

API

XMLA consists of only two SOAP methods.: execute and discover. [2] It was designed in such a way to preserve simplicity.

Execute

Execute method has two parameters:

The result of Execute command could be Multidimensional Dataset or Tabular Rowset.

Discover

Discover method was designed to model all the discovery methods possible in OLEDB including various schema rowset, properties, keywords, etc. Discover method allows users to specify both what needs to be discovered and the possible restrictions or properties. The result of Discover method is a rowset.

Query language

XMLA specifies MDXML as the query language. In the XMLA 1.1 version, the only construct in MDXML is an MDX statement enclosed in the <Statement> tag. [3]

Example

Below is an example of XMLA Execute request with MDX query in command.

<soap:Envelope><soap:Body><Executexmlns="urn:schemas-microsoft-com:xml-analysis"><Command><Statement>SELECTMeasures.MEMBERSONCOLUMNSFROMSales</Statement></Command><Properties><PropertyList><DataSourceInfo/><Catalog>FoodMart</Catalog><Format>Multidimensional</Format><AxisFormat>TupleFormat</AxisFormat></PropertyList></Properties></Execute></soap:Body></soap:Envelope>

Session management

XMLA has a notion of session state. It is maintained through predefined SOAP headers

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References

  1. ↑ "XML for Analysis gathers steam". Archived from the original on May 28, 2008.
  2. ↑ "XML for Analysis Specification". 30 June 2006.
  3. ↑ "MDX / mdXML". Archived from the original on September 7, 2008.
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