Get the metadata for all elements in a document.

See API Guide: Metadata for details.

• You can specify the optional depth query parameter to get multiple levels in an assembly. Default depth is 1.
• linkDocumentId can be specified where applicable. Combined with inferMetadataOwner (default value is false), this is used to infer metadata owner.
• includeComputedProperties can be used to include or omit computed properties. Default value is true.
• includeComputedAssemblyProperties can be used to query computed assembly properties which are generally expensive. Default value is false.
• You can also choose to include a thumbnail. Default value is false.