Schema Metadata
Schema metadata is information about the Force.com database, available to your Apex code dynamically, at runtime. It has many potential uses, such as customizing the behavior of Apex code installed in multiple organizations, driving the construction of dynamic queries, or verifying that the database is configured in a certain way. This section describes the five types of schema metadata (object, field, child relationship, picklist, and record type) and includes code that can be run in the Execute Anonymous view to demonstrate accessing them.
Note
You are limited to a maximum of 100 calls to schema metadata methods. All five types of schema metadata methods contribute equally to the limit.
Object Metadata
Object metadata is ...
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