_viz.rnc

default namespace = inherit
namespace       a = "http://relaxng.org/ns/compatibility/annotations/1.0"
namespace     rng = "http://relaxng.org/ns/structure/1.0"
datatypes     xsd = "http://www.w3.org/2001/XMLSchema-datatypes"


# Extends node
node-content &=
    element color { color-content }?
  & element position { position-content }?
  & element size { size-content }?
  & element shape { node-shape-content }?

# Extend edge
edge-content &=
    element color { color-content }?
  & element thickness { thickness-content }?
  & element shape { edge-shape-content }?

# Color
color-content =
    ((attribute r { color-channel }
  & attribute g { color-channel }
  & attribute b { color-channel })
    | attribute hex { xsd:token })
  & attribute a { alpha-channel }?

# Position
position-content =
    attribute x { xsd:float }
  & attribute y { xsd:float }
  & attribute z { xsd:float }?

# Size
size-content =
    attribute value { size-type }

# Thickness
thickness-content =
    attribute value { thickness-type }

# Node shape
node-shape-content =
    attribute value { node-shape-type }
  & attribute uri { xsd:anyURI }?

# Edge shape
edge-shape-content =
    attribute value { edge-shape-type }

# Color
color-channel = 
    xsd:nonNegativeInteger { maxInclusive = "255" }

# Alpha Channel
alpha-channel = [ a:defaultValue = "1.0" ] 
    xsd:float { minInclusive = "0.0" maxInclusive = "1.0" }

# Size
size-type = [ a:defaultValue = "1.0" ] 
    xsd:float { minInclusive = "0.0"}

# Thickness
thickness-type = [ a:defaultValue = "1.0" ] 
    xsd:float { minInclusive = "0.0"}

# Node shape
node-shape-type =  [ a:defaultValue = "disc" ] 
    string "disc" |
    string "square" |
    string "triangle" |
    string "diamond" |
    string "image"

# Edge shape
edge-shape-type =  [ a:defaultValue = "solid" ] 
    string "solid" |
    string "dotted" |
    string "dashed" |
    string "double"

# Scales specs

## common attributes
scale-label-attribute = attribute scalelabel {xsd:string}
for-value-attribute = attribute forvalue {xsd:string}
for-ratio-attribute = attribute forratio {xsd:float { minInclusive = "0" maxInclusive = "1.0" }}

## colors scale content
colors-content =  attribute scale { "quantitative" | "qualitative" }
    & scale-label-attribute?
    & element color {
        color-content
        & for-value-attribute?
        & for-ratio-attribute?
    }*
    & element colordefault {
        color-content
    }

## shapes scale content
shapes-content = scale-label-attribute?
    & attribute scale {"qualitative"} 
    & element shape {
        (node-shape-content | edge-shape-content)
        & for-value-attribute
    }*
    & element shapedefault {
        node-shape-content | edge-shape-content}

## quantitative scale content

control-point-type = xsd:float { minInclusive = "0" maxInclusive = "1.0" }

control-point-content =  attribute x {control-point-type}
                & attribute y {control-point-type}

sizes-scale-content = scale-label-attribute?
    & attribute scale {"quantitative"} 
    & element transform {
        (element pow { attribute exponent {xsd:integer}}|
        element sqrt {empty}|
        element log {empty}|
        element log10 {empty}|
        element exp {empty}|
        element exp10 {empty}|
        element spline {
            element origin-control-point { 
               control-point-content
            },
            element destination-control-point { 
                control-point-content
            }
        })
    }
    & element range {
        attribute min { size-type },
        attribute max { size-type },
        attribute default { size-type }
    }
thicknesses-scale-content = scale-label-attribute?
    & attribute scale {"quantitative"} 
    & element transform {
        (element pow { attribute exponent {xsd:integer}}|
        element sqrt {empty}|
        element log {empty}|
        element log10 {empty}|
        element exp {empty}|
        element exp10 {empty}|
        element spline {
            element origin-control-point { 
               control-point-content
            },
            element destination-control-point { 
                control-point-content
            }
        })
    }
    & element range {
        attribute min { thickness-type },
        attribute max { thickness-type },
        attribute default { thickness-type }
    }

## layout 
layout = element layout {
    attribute algorithm { xsd:string },
    attribute step {xsd:positiveInteger},
    attribute referenceURL { xsd:anyURI}?,
    element param {
        attribute name { xsd:string },
        attribute type { attrtype-type},
        attribute value { xsd:string }
    }*
}

# Extends attribute with scales
attribute-content &= element colors {colors-content}?
    & element shapes {shapes-content}?
    & element sizes {sizes-scale-content}?
    & element thicknesses {thicknesses-scale-content}?

# Extends attributes with positions and defaultscales
attributes-content &= element positions { layout+}?
    & element defaultscales { 
        attribute colors { id-type}?,
        attribute sizes { id-type}?,
        attribute shapes { id-type}?,
        attribute thicknesses { id-type}?
    }?