KeyView 23.4

# Access Metadata Fields

This section explains how to process metadata fields using the KeyView API.

## Standardized Fields

When KeyView understands the meaning of a metadata field in a document, it outputs that data in a standardized field. Standardized fields are represented as KVMetadataElement objects with an `eKey` set to a value other than `KVMetadataKey_Other`. For standardized fields, the following is true:

- `eKey` is the standardized field key, which indicates the meaning of the field.

- `pKey` is uniquely determined by `eKey`. If you are handling the value of a standardized field based on its `eKey`, you can ignore `pKey`. `pKey` is provided so that standardized fields can optionally be handled in the same way as non-standardized fields.

- `pValue` is converted to a standard type, and, where appropriate, standard units.

Each standardized field is guaranteed to occur at most once in the metadata output. For example, the metadata output will contain zero or one KVMetadataElement objects with `eKey` equal to `KVMetadataKey_Title`.

For a full list of the standardized metadata fields, see Standardized Metadata Fields.

## Non-standardized fields

Non-standardized fields include user created fields, or fields that are specific to that type of document. KeyView handles these in the following way:

- `eKey` is set to `KVMetadataKey_Other` to signify that it is a non-standardized field.
- `pKey` contains a string representation of a field's key. If a field key exists in the document, `pKey` is set to that string. Otherwise, KeyView generates a value of `pKey` to describe the field.
- `pValue` contains the field's value, stored in an appropriate data type.

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Version 23.4 | Last updated September 2023

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Product: IDOL KeyView 23.4

Topic Title: Access Metadata Fields