Start specification for olap4j version 2.0.

olap4j_version_2_specification.md

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+# Specification: olap4j version 2.0
+
+## Introduction
+
+Goals of olap4j version 2.0 are:
+* Support metadata and API changes in recent SSAS (Microsoft SQL Server Analysis Services) and XMLA (XML for Analysis)
+* Support metadata and API changes in Mondrian version 4
+
+We aim to be backwards compatible in the same way that each JDBC release is backwards compatible:
+* Applications developed against earlier versions will work against 2
+* Drivers supporting version 2 will also serve as 1.x drivers (JDBC version 4 broke this rule, and it was painful for driver developers)
+* Some work will be required to convert a version 1.x driver to a version 2 driver
+
+Timescale:
+* Beta in Q3 2013
+* Production in Q4 2013
+
+## Features
+
+Existing bugs, features and pull requests
+* https://github.com/olap4j/olap4j/issues/4 Integrate hierarchy structure
+* TODO: review feature requests at SF.net http://sourceforge.net/p/olap4j/feature-requests
+* TODO: review bugs at SF.net http://sourceforge.net/p/olap4j/bugs
+* Measure group names http://sourceforge.net/p/olap4j/discussion/577988/thread/781635f9
+