mdx 规范？
我正在寻找 MDX 的正式规范。通过 xmla 规范网站，我发现它可能位于“OLE DB for OLAP 规范”中，该规范应该可以从微软获得，但我在他们的网站上找不到它。
有什么线索吗？我本质上是在寻找 MDX 查询的结构。
I'm looking for the formal specification of MDX. Going via xmla specification site, I found it may be in "OLE DB for OLAP specification" which is supposed to be available from microsoft, but I can't find it on their site anywhere.
Any clues? I'm looking for the structure of MDX queries essentially.
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我找到了语言和语句参考：
例如，请查看：SELECT 语句。不是一个规范，但我认为应该足够了。
I have found language and statement references:
For example, check this out: SELECT Statement. Not a specification, but should be enough, I think.
如果您正在寻找 OLE DB for OLAP 规范，请点击以下链接：
MDX 概念 (MSDN)
您会注意到，它比主线 SQL Server Analysis Services 文档小得多（而且更旧）。严格来说，上面的链接是“标准”。从那时起，微软基本上让该标准陷入困境，并选择在 Analysis Services 内扩展该标准。
最近，雷德蒙德的精力已转向 BISM/DAX，因此即使是 Analysis Services 的 MDX 也已萎靡不振。
If you're looking for the OLE DB for OLAP spec, this is the link:
MDX Concepts (MSDN)
You'll note that this is quite a bit smaller (and older) than the mainline SQL Server Analysis Services documentation. Strictly speaking, the link above is the "standard". Since then, Microsoft has largely left the standard to languish and chosen to expand on the standard within Analysis Services.
Of late, Redmond's energy has shifted to BISM/DAX so even Analysis Services' MDX has languished.