The anSI/nISo z39.87 standard, Data Dictionary –Technical Metadata for Digital Still Images, defines semantic units to describe digital raster images. The standard does not prescribe a serialization. But, in partnership with NISO, the Library of Congress maintains an XML Schema called mIX (metadata for Images in Xml Schema) that is widely used by content creators and in the digital preservation community. Tools, such as JHOVE, are available to extract technical metadata from image files and export the metadata as MIX serialization.