Daily DAX : Day 446 INFO.CSDLMETADATA

Power BI DAX Function: INFO.CSDLMETADATA

INFO.CSDLMETADATA` is a specialized DAX function introduced as part of a broader set of "INFO" functions (like `INFO.TABLES` or `INFO.MEASURES`) used for **model introspection**. It allows you to programmatically access the underlying structure of your Power BI semantic model.


What does it do?


The function returns a table with a single column containing the Conceptual Schema Definition Language (CSDL) metadata of your model in XML format.


In plain English, it exports a highly technical "blueprint" of your entire data model—including tables, columns, relationships, and measures—as a structured XML string. It is essentially the DAX equivalent of the `DISCOVER_CSDL_METADATA` Dynamic Management View (DMV) used in Analysis Services.


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Syntax and Output


The syntax is straightforward as it requires no arguments:


```dax

EVALUATE

INFO.CSDLMETADATA()


```


  • Return Value: A table with one column and one row.
  • Content: A long string of XML data that follows the OData CSDL standard.


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Primary Use Cases


While functions like `INFO.VIEW.MEASURES` are easier for humans to read, `INFO.CSDLMETADATA` is used for deep technical tasks:


  • External Tool Integration: This is the exact same call that tools like DAX Studio or Tabular Editor use to populate their metadata panes. If you are building a custom tool or script to analyze a Power BI file, this function provides the most comprehensive "all-in-one" schema definition.
  • Comprehensive Documentation: If you need to generate a full data dictionary that includes details not found in simpler INFO functions (like specific OData annotations or complex property mappings), you can parse this XML.
  • Model Comparison: By saving the XML output from two different versions of a model, you can run a "diff" (comparison) to see exactly what changed in the schema at a structural level.
  • Automated Validation: Developers use this to run automated checks against a model to ensure it follows specific naming conventions or structural requirements before it is deployed to production.


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Key Considerations


1. Readability: The output is raw XML. To make it useful within Power BI, you would typically need to use an external parser or Power Query to "drill down" into the XML attributes.

2. Permissions: You generally need Build permissions or Administrative access to the semantic model to run INFO functions.

3. Experimental Status: Many `INFO` functions are currently undocumented or considered "internal" by Microsoft. While they are very stable in the DAX Query View, use caution when relying on them for critical production calculated tables.

4. DAX Query View: The best place to see this in action is the DAX Query View in Power BI Desktop. Simply type `EVALUATE INFO.CSDLMETADATA()` and click Run.


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