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title: Appendices
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locale: en-us
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# Appendices

- **[Apex Versioned Behavior Changes](https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/versioned_behavior_changes.htm)**  
    This document includes major Apex behavior changes across API versions, organized by version number for easy lookup. It isn’t an exhaustive list of all versioned Apex behavior. For example, this compilation excludes versioned changes to Connect in Apex and classes in the ConnectApi namespace.
- **[Shipping Invoice Example](https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_shopping_cart_example.htm)**
- **[Reserved Keywords](https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_reserved_words.htm)**  
    These words can be used only as keywords.