Standard Metadata Format Specification (Java SE 26 & JDK 26)

# Standard (Plug-in Neutral) Metadata Format Specification

The plug-in neutral "javax_imageio_1.0" format consists of a root node named "javax_imageio_1.0" which has child nodes "chroma", "compression", "dimension", "document", "text", "tile", and "transparency". The format is described by the following DTD:

    <!DOCTYPE "javax_imageio_1.0" [

      <!ELEMENT "javax_imageio_1.0" (Chroma?, Compression?, Data?, Dimension?,
        Document?, Text?, Transparency?)>

        <!ELEMENT "Chroma" (ColorSpaceType?, NumChannels?, Gamma?,
          BlackIsZero?, Palette?, BackgroundIndex?, BackgroundColor?)>
          <!-- Chroma (color) information -->

          <!ELEMENT "ColorSpaceType" EMPTY>
            <!-- The raw color space of the image -->
            <!ATTLIST "ColorSpaceType" "name" ("XYZ" | "Lab" | "Luv" |
              "YCbCr" | "Yxy" | "YCCK" | "PhotoYCC" | "RGB" | "GRAY" | "HSV" |
              "HLS" | "CMYK" | "CMY" | "2CLR" | "3CLR" | "4CLR" | "5CLR" |
              "6CLR" | "7CLR" | "8CLR" | "9CLR" | "ACLR" | "BCLR" | "CCLR" |
              "DCLR" | "ECLR" | "FCLR") #REQUIRED>

          <!ELEMENT "NumChannels" EMPTY>
            <!-- The number of channels in the raw image, including alpha -->
            <!ATTLIST "NumChannels" "value" #CDATA #REQUIRED>
              <!-- Data type: List of Integer -->

          <!ELEMENT "Gamma" EMPTY>
            <!-- The image gamma -->
            <!ATTLIST "Gamma" "value" #CDATA #REQUIRED>
              <!-- Data type: Float -->

          <!ELEMENT "BlackIsZero" EMPTY>
            <!-- True if smaller values represent darker shades -->
            <!ATTLIST "BlackIsZero" "value" ("TRUE" | "FALSE") "TRUE">

          <!ELEMENT "Palette" (PaletteEntry)*>
            <!-- Palette-color information -->

            <!ELEMENT "PaletteEntry" EMPTY>
              <!-- A palette entry -->
              <!ATTLIST "PaletteEntry" "index" #CDATA #REQUIRED>
                <!-- The index of the palette entry -->
                <!-- Data type: Integer -->
              <!ATTLIST "PaletteEntry" "red" #CDATA #REQUIRED>
                <!-- The red value for the palette entry -->
                <!-- Data type: Integer -->
              <!ATTLIST "PaletteEntry" "green" #CDATA #REQUIRED>
                <!-- The green value for the palette entry -->
                <!-- Data type: Integer -->
              <!ATTLIST "PaletteEntry" "blue" #CDATA #REQUIRED>
                <!-- The blue value for the palette entry -->
                <!-- Data type: Integer -->
              <!ATTLIST "PaletteEntry" "alpha" #CDATA "255">
                <!-- The alpha value for the palette entry -->
                <!-- Data type: Integer -->

          <!ELEMENT "BackgroundIndex" EMPTY>
            <!-- A palette index to be used as a background -->
            <!ATTLIST "BackgroundIndex" "value" #CDATA #REQUIRED>
              <!-- Data type: Integer -->

          <!ELEMENT "BackgroundColor" EMPTY>
            <!-- An RGB triple to be used as a background -->
            <!ATTLIST "BackgroundColor" "red" #CDATA #REQUIRED>
              <!-- The red background value -->
              <!-- Data type: Integer -->
            <!ATTLIST "BackgroundColor" "green" #CDATA #REQUIRED>
              <!-- The green background value -->
              <!-- Data type: Integer -->
            <!ATTLIST "BackgroundColor" "blue" #CDATA #REQUIRED>
              <!-- The blue background value -->
              <!-- Data type: Integer -->

        <!ELEMENT "Compression" (CompressionTypeName?, Lossless?,
          NumProgressiveScans?, BitRate?)>
          <!-- Compression information -->

          <!ELEMENT "CompressionTypeName" EMPTY>
            <!-- The name of the compression scheme in use -->
            <!ATTLIST "CompressionTypeName" "value" #CDATA #REQUIRED>
              <!-- Data type: String -->

          <!ELEMENT "Lossless" EMPTY>
            <!-- True if the compression scheme is lossless -->
            <!ATTLIST "Lossless" "value" ("TRUE" | "FALSE") "TRUE">

          <!ELEMENT "NumProgressiveScans" EMPTY>
            <!-- The number of progressive scans used in the image encoding -->
            <!ATTLIST "NumProgressiveScans" "value" #CDATA #REQUIRED>
              <!-- Data type: Integer -->

          <!ELEMENT "BitRate" EMPTY>
            <!-- The estimated bit rate of the compression scheme -->
            <!ATTLIST "BitRate" "value" #CDATA #REQUIRED>
              <!-- Data type: Float -->

        <!ELEMENT "Data" (PlanarConfiguration?, SampleFormat?, BitsPerSample?,
          SignificantBitsPerSample?, SampleMSB?)>
          <!-- Information on the image layout -->

          <!ELEMENT "PlanarConfiguration" EMPTY>
            <!-- The organization of image samples in the stream -->
            <!ATTLIST "PlanarConfiguration" "value" ("PixelInterleaved" |
              "PlaneInterleaved" | "LineInterleaved" | "TileInterleaved")
               #REQUIRED>

          <!ELEMENT "SampleFormat" EMPTY>
            <!-- The numeric format of image samples -->
            <!ATTLIST "SampleFormat" "value" ("SignedIntegral" |
              "UnsignedIntegral" | "Real" | "Index") #REQUIRED>

          <!ELEMENT "BitsPerSample" EMPTY>
            <!-- The number of bits per sample -->
            <!ATTLIST "BitsPerSample" "value" #CDATA #REQUIRED>
              <!-- A list of integers, one per channel -->
              <!-- Data type: List of Integer -->
              <!-- Min length: 1 -->

          <!ELEMENT "SignificantBitsPerSample" EMPTY>
            <!-- The number of significant bits per sample -->
            <!ATTLIST "SignificantBitsPerSample" "value" #CDATA #REQUIRED>
              <!-- A list of integers, one per channel -->
              <!-- Data type: List of Integer -->
              <!-- Min length: 1 -->

          <!ELEMENT "SampleMSB" EMPTY>
            <!-- The position of the most significant bit of each sample -->
            <!ATTLIST "SampleMSB" "value" #CDATA #REQUIRED>
              <!-- A list of integers, one per channel -->
              <!-- Data type: List of Integer -->
              <!-- Min length: 1 -->

        <!ELEMENT "Dimension" (PixelAspectRatio?, ImageOrientation?,
          HorizontalPixelSize?, VerticalPixelSize?,
          HorizontalPhysicalPixelSpacing?, VerticalPhysicalPixelSpacing?,
          HorizontalPosition?, VerticalPosition?, HorizontalPixelOffset?,
          VerticalPixelOffset?, HorizontalScreenSize?, VerticalScreenSize?)>
          <!-- Dimension information -->

          <!ELEMENT "PixelAspectRatio" EMPTY>
            <!-- The width of a pixel divided by its height -->
            <!ATTLIST "PixelAspectRatio" "value" #CDATA #REQUIRED>
              <!-- Data type: Float -->

          <!ELEMENT "ImageOrientation" EMPTY>
            <!-- The desired orientation of the image in terms of flips and
                 counter-clockwise rotations -->
            <!ATTLIST "ImageOrientation" "value" ("Normal" | "Rotate90" |
              "Rotate180" | "Rotate270" | "FlipH" | "FlipV" |
              "FlipHRotate90" | "FlipVRotate90") #REQUIRED>

          <!ELEMENT "HorizontalPixelSize" EMPTY>
            <!-- The width of a pixel, in millimeters, as it should be rendered
                 on media -->
            <!ATTLIST "HorizontalPixelSize" "value" #CDATA #REQUIRED>
              <!-- Data type: Float -->

          <!ELEMENT "VerticalPixelSize" EMPTY>
            <!-- The height of a pixel, in millimeters, as it should be
                 rendered on media -->
            <!ATTLIST "VerticalPixelSize" "value" #CDATA #REQUIRED>
              <!-- Data type: Float -->

          <!ELEMENT "HorizontalPhysicalPixelSpacing" EMPTY>
            <!-- The horizontal distance in the subject of the image, in
                 millimeters, represented by one pixel at the center of the
                 image -->
            <!ATTLIST "HorizontalPhysicalPixelSpacing" "value" #CDATA #REQUIRED>
              <!-- Data type: Float -->

          <!ELEMENT "VerticalPhysicalPixelSpacing" EMPTY>
            <!-- The vertical distance in the subject of the image, in
                 millimeters, represented by one pixel at the center of the
                 image -->
            <!ATTLIST "VerticalPhysicalPixelSpacing" "value" #CDATA #REQUIRED>
              <!-- Data type: Float -->

          <!ELEMENT "HorizontalPosition" EMPTY>
            <!-- The horizontal position, in millimeters, where the image
                 should be rendered on media -->
            <!ATTLIST "HorizontalPosition" "value" #CDATA #REQUIRED>
              <!-- Data type: Float -->

          <!ELEMENT "VerticalPosition" EMPTY>
            <!-- The vertical position, in millimeters, where the image should
                 be rendered on media -->
            <!ATTLIST "VerticalPosition" "value" #CDATA #REQUIRED>
              <!-- Data type: Float -->

          <!ELEMENT "HorizontalPixelOffset" EMPTY>
            <!-- The horizontal position, in pixels, where the image should be
                 rendered onto a raster display -->
            <!ATTLIST "HorizontalPixelOffset" "value" #CDATA #REQUIRED>
              <!-- Data type: Integer -->

          <!ELEMENT "VerticalPixelOffset" EMPTY>
            <!-- The vertical position, in pixels, where the image should be
                 rendered onto a raster display -->
            <!ATTLIST "VerticalPixelOffset" "value" #CDATA #REQUIRED>
              <!-- Data type: Integer -->

          <!ELEMENT "HorizontalScreenSize" EMPTY>
            <!-- The width, in pixels, of the raster display into which the
                 image should be rendered -->
            <!ATTLIST "HorizontalScreenSize" "value" #CDATA #REQUIRED>
              <!-- Data type: Integer -->

          <!ELEMENT "VerticalScreenSize" EMPTY>
            <!-- The height, in pixels, of the raster display into which the
                 image should be rendered -->
            <!ATTLIST "VerticalScreenSize" "value" #CDATA #REQUIRED>
              <!-- Data type: Integer -->

        <!ELEMENT "Document" (FormatVersion?, SubimageInterpretation?,
          ImageCreationTime?, ImageModificationTime?)>
          <!-- Document information -->

          <!ELEMENT "FormatVersion" EMPTY>
            <!-- The version of the format used by the stream -->
            <!ATTLIST "FormatVersion" "value" #CDATA #REQUIRED>
              <!-- Data type: String -->

          <!ELEMENT "SubimageInterpretation" EMPTY>
            <!-- The interpretation of this image in relation to the other
                 images stored in the same stream -->
            <!ATTLIST "SubimageInterpretation" "value" ("Standalone" |
              "SinglePage" | "FullResolution" | "ReducedResolution" |
              "PyramidLayer" | "Preview" | "VolumeSlice" | "ObjectView" |
              "Panorama" | "AnimationFrame" | "TransparencyMask" |
              "CompositingLayer" | "SpectralSlice" | "Unknown") #REQUIRED>

          <!ELEMENT "ImageCreationTime" EMPTY>
            <!-- The time of image creation -->
            <!ATTLIST "ImageCreationTime" "year" #CDATA #REQUIRED>
              <!-- The full year (e.g., 1967, not 67) -->
              <!-- Data type: Integer -->
            <!ATTLIST "ImageCreationTime" "month" #CDATA #REQUIRED>
              <!-- The month, with January = 1 -->
              <!-- Data type: Integer -->
              <!-- Min value: 1 (inclusive) -->
              <!-- Max value: 12 (inclusive) -->
            <!ATTLIST "ImageCreationTime" "day" #CDATA #REQUIRED>
              <!-- The day of the month -->
              <!-- Data type: Integer -->
              <!-- Min value: 1 (inclusive) -->
              <!-- Max value: 31 (inclusive) -->
            <!ATTLIST "ImageCreationTime" "hour" #CDATA "0">
              <!-- The hour from 0 to 23 -->
              <!-- Data type: Integer -->
              <!-- Min value: 0 (inclusive) -->
              <!-- Max value: 23 (inclusive) -->
            <!ATTLIST "ImageCreationTime" "minute" #CDATA "0">
              <!-- The minute from 0 to 59 -->
              <!-- Data type: Integer -->
              <!-- Min value: 0 (inclusive) -->
              <!-- Max value: 59 (inclusive) -->
            <!ATTLIST "ImageCreationTime" "second" #CDATA "0">
              <!-- The second from 0 to 60 (60 = leap second) -->
              <!-- Data type: Integer -->
              <!-- Min value: 0 (inclusive) -->
              <!-- Max value: 60 (inclusive) -->

          <!ELEMENT "ImageModificationTime" EMPTY>
            <!-- The time of the last image modification -->
            <!ATTLIST "ImageModificationTime" "year" #CDATA #REQUIRED>
              <!-- The full year (e.g., 1967, not 67) -->
              <!-- Data type: Integer -->
            <!ATTLIST "ImageModificationTime" "month" #CDATA #REQUIRED>
              <!-- The month, with January = 1 -->
              <!-- Data type: Integer -->
              <!-- Min value: 1 (inclusive) -->
              <!-- Max value: 12 (inclusive) -->
            <!ATTLIST "ImageModificationTime" "day" #CDATA #REQUIRED>
              <!-- The day of the month -->
              <!-- Data type: Integer -->
              <!-- Min value: 1 (inclusive) -->
              <!-- Max value: 31 (inclusive) -->
            <!ATTLIST "ImageModificationTime" "hour" #CDATA "0">
              <!-- The hour from 0 to 23 -->
              <!-- Data type: Integer -->
              <!-- Min value: 0 (inclusive) -->
              <!-- Max value: 23 (inclusive) -->
            <!ATTLIST "ImageModificationTime" "minute" #CDATA "0">
              <!-- The minute from 0 to 59 -->
              <!-- Data type: Integer -->
              <!-- Min value: 0 (inclusive) -->
              <!-- Max value: 59 (inclusive) -->
            <!ATTLIST "ImageModificationTime" "second" #CDATA "0">
              <!-- The second from 0 to 60 (60 = leap second) -->
              <!-- Data type: Integer -->
              <!-- Min value: 0 (inclusive) -->
              <!-- Max value: 60 (inclusive) -->

        <!ELEMENT "Text" (TextEntry)*>
          <!-- Text information -->

          <!ELEMENT "TextEntry" EMPTY>
            <!-- A text entry -->
            <!ATTLIST "TextEntry" "keyword" #CDATA #IMPLIED>
              <!-- A keyword associated with the text entry -->
              <!-- Data type: String -->
            <!ATTLIST "TextEntry" "value" #CDATA #REQUIRED>
              <!-- the text entry -->
              <!-- Data type: String -->
            <!ATTLIST "TextEntry" "language" #CDATA #IMPLIED>
              <!-- The language of the text -->
              <!-- Data type: String -->
            <!ATTLIST "TextEntry" "encoding" #CDATA #IMPLIED>
              <!-- The encoding of the text -->
              <!-- Data type: String -->
            <!ATTLIST "TextEntry" "compression" ("none" | "lzw" | "zip" |
              "bzip" | "other") "none">
              <!-- The method used to compress the text -->

        <!ELEMENT "Transparency" (Alpha?, TransparentIndex?,
          TransparentColor?, TileTransparencies?, TileOpacities?)>
          <!-- Transparency information -->

          <!ELEMENT "Alpha" EMPTY>
            <!-- The type of alpha information contained in the image -->
            <!ATTLIST "Alpha" "value" ("none" | "premultiplied" |
              "nonpremultiplied") "none">

          <!ELEMENT "TransparentIndex" EMPTY>
            <!-- A palette index to be treated as transparent -->
            <!ATTLIST "TransparentIndex" "value" #CDATA #REQUIRED>
              <!-- Data type: Integer -->

          <!ELEMENT "TransparentColor" EMPTY>
            <!-- An RGB color to be treated as transparent -->
            <!ATTLIST "TransparentColor" "value" #CDATA #REQUIRED>
              <!-- Data type: List of Integer -->

          <!ELEMENT "TileTransparencies" (TransparentTile)*>
            <!-- A list of completely transparent tiles -->

            <!ELEMENT "TransparentTile" EMPTY>
              <!-- The index of a completely transparent tile -->
              <!ATTLIST "TransparentTile" "x" #CDATA #REQUIRED>
                <!-- The tile's X index -->
                <!-- Data type: Integer -->
              <!ATTLIST "TransparentTile" "y" #CDATA #REQUIRED>
                <!-- The tile's Y index -->
                <!-- Data type: Integer -->

          <!ELEMENT "TileOpacities" (OpaqueTile)*>
            <!-- A list of completely opaque tiles -->

            <!ELEMENT "OpaqueTile" EMPTY>
              <!-- The index of a completely opaque tile -->
              <!ATTLIST "OpaqueTile" "x" #CDATA #REQUIRED>
                <!-- The tile's X index -->
                <!-- Data type: Integer -->
              <!ATTLIST "OpaqueTile" "y" #CDATA #REQUIRED>
                <!-- The tile's Y index -->
                <!-- Data type: Integer -->
    ]>