File Content Extraction 26.1
Filter SDK C Programming Guide

# KVMetadataElement

This structure defines a single metadata element. This structure is defined in `kvmetadata.h`.

    typedef struct tag_KVMetadataElement
    {
        KVStructHeader;
        KVString* pKey;
        KVMetadataKey eKey;
        KVMetadataValueType eType;
        void* pValue;
        BOOL bHasStandardAlternative;
        BOOL bIsSuperseded;
        KVMetadataSource eSource;
    } KVMetadataElement;

## Member Descriptions

`KVStructHeader` | The version of the structure. See KVStructHead.
`pKey` | A pointer to a KVString member, whose value specifies the key for this metadata element.
`eKey` | A value from the KVMetadataKey enum that specifies the standardized field name. The value `KVMetadataKey_Other` indicates that this element does not represent a standardized field.
`eType` | A value from the KVMetadataValueType enum, which specifies how to interpret the `pValue` member.
`pValue` | A pointer to the value for this metadata element, which must be interpreted according to the value of the `eType` member.
`bHasStandardAlternative` | You can use this member to determine whether a non-standardized element has a standardized counterpart. When this member is `true`, this element contains metadata that also exists in a standardized `KVMetadataElement` in the same `KVMetadataList`. The standardized element might present the metadata with different units. If `eKey` is `KVMetadataKey_Other` and this member is `false`, the element represents a non-standard field and no standard counterpart exists.
`bIsSuperseded` | A Boolean value that specifies whether this element has been superseded, meaning that this element exists only to preserve backwards compatibility. An element can be superseded to fix issues with the key or value type. When this value is `true`, the same metadata is available through an improved `KVMetadataElement` in the same `KVMetadataList`.
`eSource` | A value from the KVMetadataSource enum that specifies the storage mechanism the document used to store this element. For example, this value might be used to determine which elements were stored in the XMP packet.

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Version 26.1 | Last updated January 2026

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Product: File Content Extraction 26.1

Topic Title: KVMetadataElement