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Nov 18, 2016
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Error in documentation regarding ItemDefinitionGroup metadata #2

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21 changes: 18 additions & 3 deletions docs/msbuild/item-definitions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -178,13 +178,28 @@ translation.priority.ht:
<test>
<yes>1</yes>
</test>
<i>
<i>
<m>m0</m>
<m Condition="'%(test.yes)'=='1'">m1</m>
</i>
</ItemDefinitionGroup>

```

In this example, item "i" references item "test" in the Condition.
In the above example, item "i" references item "test" in its Condition. This Condition will never be true because MSBuild interprets a reference to another item's metadata in an ItemDefinitionGroup as the empty string. Therefore, "m" would be set to "m0."

```
<ItemDefinitionGroup>
<i>
<m>m0</m>
<yes>1</yes>
<m Condition="'%(i.yes)'=='1'">m1</m>
</i>
</ItemDefinitionGroup>

```

In the above example, "m" would be set to the value "m1" as the Condition references item "i"'s metadata value for item "yes."

## Overriding and Deleting Metadata
Metadata defined in an ItemDefinitionGroup element can be overridden in a later ItemDefinitionGroup element by setting the metadata value to blank. You can also effectively delete a metadata item by setting it to an empty value. For example:
Expand Down Expand Up @@ -250,4 +265,4 @@ translation.priority.ht:
```

## See Also
[Batching](../msbuild/msbuild-batching.md)
[Batching](../msbuild/msbuild-batching.md)