The Extensible Metadata Platform (XMP) is an ISO standard, originally created by Adobe Systems Inc., for the creation, processing and interchange of standardized and custom metadata for all kinds of resources.
XMP standardizes a data model, a serialization format and core properties for the definition and processing of extensible metadata. It also provides guidelines on how XMP should be embedded into a number of popular image, video and document file formats (e.g. JPEG and PDF) without breaking their readability by applications that aren't aware of XMP. Therefore, the non-XMP metadata has to be reconciled with the XMP properties. Embedding metadata avoids a lot of problems that occur when metadata is stored separately, but for other use cases it can also be stored as a sidecar file.
The XMP data model, serialization format and core properties have been published by the International Organization for Standardization as ISO 16684-1:2012 standard.
Read more about Extensible Metadata Platform: XMP Data Model, Serialization of XMP, Embedding of XMP, History
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