JIIX format reference

Reference of the JSON Interactive Ink eXchange format (JIIX) version 2.

Content

JIIX is an exchange format to export, share and re-import the internal semantics of the Interactive Ink model.

As such, it is designed to host information about:

  • Content - strokes, glyphs and graphical primitives
  • Semantic interpretation of the content, including lists
  • Style information - decorations, color, width, font, etc.

When exporting JIIX from iink SDK, depending on the use case, you may sometimes want to only retrieve part of this information. This is managed at configuration level, via the following keys:

  • export.jiix.strokes - Export ink strokes
  • export.jiix.glyphs - Export converted glyphs
  • export.jiix.primitives - Export shape primitives (lines, circles, etc.)
  • export.jiix.style - Export detailed styling information (color, width, font, etc.)
  • export.jiix.text.chars - Export detailed information about the characters in the text interpretation
  • export.jiix.text.words - Export detailed information about the words in the text interpretation

For more information about these parameters, including default values, refer to the configuration reference.

Versioning

The version of the format that the current document conforms to is given by the version property of the root of the JSON document (as the root of the document corresponds to the root block of the exposed content block hierarchy, the version property belongs to this root block).

Description Content Note
version of the JIIX format A string identifying the current iteration of the format This property was added with iink SDK 1.3. JIIX documents before 1.3 do not have this property

For example, if the root block is a “Text” block, we will have something like:

{
 "version": "2",
 "type": "Text",
 "bounding-box": { ... },
 "label": "Hello world!",
 "words": [ ... ],
 "id": "MainBlock"
}

Unit system

Units are not explicitly provided in a JIIX document. They shall be understood as model units, that is to say millimeters. The actual rendering of a JIIX document on the screen will then depend on the dpi and any other parameter (zoom, offset) used to configure the renderer.

Structure

Block hierarchy

JIIX documents are organized as a hierarchy of JSON objects (called “Blocks” in this page) that mirrors the block hierarchy of a content part. Each object has a specific type string property identifying it as a text block, a diagram block, a math node, etc. and defining the block semantics.

For example, a simple diagram may aggregate a text label and a rectangular node:

{
 "type": "Diagram",
 "elements": [ {
   "type": "Text",
   ...
  }, {
   "type": "Node",
   "kind": "rectangle",
   ...
  } ],
 ...
}

This semantics, in turn defines how sub-blocks are aggregated. For example :

  • A Diagram block will host an array of “Diagram Item” blocks under its elements property.
  • A Math block will host an array of “Math Node” blocks under its expressions property.
  • A generic Container block will host its sub-blocks under a children property.
To know the precise semantics of a given type of block, please refer to its detailed description below.

Properties common to blocks

Whatever their types, all blocks share the following common properties:

Property Description Content Note
id Block unique reference in the context of the document A string  
bounding-box Extent of the block x, y, width, height - 4 numerical values defining a rectangle which upper-left corner is positioned at coordinates (x, y) and of size (width, height) Present in the JIIX export when export.jiix.bounding-box configuration is true

For example, a simple drawing block can be represented as:

{
 "type": "Drawing",
 "id": "MainBlock",
 "bounding-box": {
  "x": 20.43125,
  "y": 31.272942,
  "width": 9.9375,
  "height": 8.9725456
 },
 ...
}

Other potential properties depend on the type of the block. Refer to the “blocks” section for more details.

Block content description

Block content is described using items, which represent what is actually visible when rendering the model.

Items

Items are used to describe the content of blocks in terms of ink, glyphs or shape primitives.

Like blocks, items share common properties:

Property Description Content
type Type of the item stroke, line, arc or glyph
id Item unique reference in the context of the document. A string

Stroke item

A stroke item represents a standalone portion of ink, that is to say the trajectory of a writing tool between a pointer down and the corresponding pointer up.

It has the following specific properties:

Property Description Content
timestamp Precise date and time of the pointer down Example: "2018-11-28 09:31:43.893000"
X X coordinates of the different points of the stroke, ordered from pointer down to pointer up An array of numbers
Y Y coordinates of the different points of the stroke, ordered from pointer down to pointer up An array of numbers.
F Force (a.k.a pressure) of the different points of the stroke, ordered from pointer down to pointer up An array of numbers
T Time offset of the different points of the stroke in ms relatively to the timestamp of the stroke, ordered from pointer down to pointer up An array of numbers

Example:

{
 "type": "stroke",
 "id": "0000000001002300ff00",
 "timestamp": "2018-11-28 09:31:43.893000",
 "X": [ 21.43125, 21.629688, 22.026562, 22.621876, 23.614063, 24.606251, 25.003124, 25.796875, 26.789062, 26.987499, 27.582813, 28.178125, 28.376562, 28.773438, 28.971874, 29.170313, 29.36875, 29.36875 ],
 "Y": [ 39.245487, 39.046272, 38.448627, 37.651764, 36.8549, 35.858822, 35.460392, 34.663528, 33.866665, 33.66745, 33.468235, 32.870586, 32.671371, 32.671371, 32.472157, 32.472157, 32.272942, 32.272942 ],
 "F": [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ],
 "T": [ 0, 168, 176, 187, 196, 206, 215, 224, 232, 241, 249, 258, 266, 274, 276, 289, 296, 305 ]
}
The number of elements in X, Y, T and F must be strictly identical.

Line item

A line item represents a converted line primitive, for instance the edge of a polygon.

It has the following specific properties:

Property Description Content
timestamp Timestamp of the stroke that was converted into this primitive. Example: "2018-11-29 10:03:05.980000".
x1 X coordinate of the first point defining the line A number
y1 Y coordinate of the first point defining the line A number
x2 X coordinate of the second point defining the line A number
y2 Y coordinate of the second point defining the line A number

Example:

{
 "type": "line",
 "id": "00001d0001000300ff00",
 "timestamp": "2018-11-29 10:03:05.980000",
 "x1": 67.351799,
 "y1": 72.70636,
 "x2": 74.252617,
 "y2": 60.756866
}

Arc item

An arc item represents a converted arc primitive, for instance a curved connector in a diagram or a portion of an ellipse.

It has the following specific properties:

Property Description Content
timestamp Timestamp of the stroke that was converted into this primitive. Example: "2018-11-29 10:03:05.980000"
cx X coordinate of the arc center A number
cy Y coordinate of the arc center A number
rx x-axis or semi-major radius A number (must be positive)
ry y-axis or semi-minor radius A number (must be positive)
phi x-axis rotation angle A number
startAngle Start angle (prior to stretch and rotate) A number
sweepAngle Sweep angle (prior to stretch and rotate) A number

Example:

{
 "type": "arc",
 "id": "00001c0001008100ff00",
 "timestamp": "2018-11-29 10:03:02.108000",
 "cx": 34.332874,
 "cy": 71.93309,
 "rx": 9.3729343,
 "ry": 9.3729343,
 "phi": 0,
 "startAngle": 0,
 "sweepAngle": 6.2831855
}

Glyph item

A glyph item represents a converted typeset character.

It has the following specific properties:

Property Description Content Note
timestamp Timestamp of the stroke that was converted into this glyph Example: "2018-11-28 13:37:03.514000"  
label Character represented by the glyph Example: "B"  
baseline Baseline position A number Optional (not used for the glyphs present in a math context)
x-height x height A number Optional (not used for the glyphs present in a math context)
square-root-ratio Horizontal ratio between the size of the glyph and the “V” shape part of the square root A number Only for square roots
left-side-bearing Glyph left side bearing A number  
right-side-bearing Glyph right side bearing A number  

Example:

{
 "type": "glyph",
 "id": "00003c0001000700ff00",
 "timestamp": "2018-11-28 13:37:03.514000",
 "bounding-box": { ... },
 "label": "B",
 "baseline": 1.0000001,
 "x-height": 0.73378384,
 "left-side-bearing": -0.21175167,
 "right-side-bearing": 1.0937916
}

Text interpretation

Text interpreted by iink SDK is represented by word and character objects as part of a Text block.

Word object

A word object represents the recognition of a word made by the MyScript engine. Note that to get such interpretation in JIIX export, your need to set the export.jiix.text.words configuration option to true.

It has the following properties:

Property Description Content Note
label Top recognition result associated with this word A string  
candidates List of recognition candidates associated with this word An array of strings  
bounding-box Extent of the word. x, y, width, height - 4 numerical values defining a rectangle which upper-left corner is positioned at coordinates (x, y) and of size (width, height). Present in the JIIX export when export.jiix.bounding-box configuration is true.
items Ink and/or glyphs composing the word. An array of stroke and/or glyph items Strokes only present in JIIX export when export.jiix.strokes is configured to true, glyphs only present when export.jiix.glyphs is configured to true
first-char Index of the first character contained in this word. An integer, representing the index of a character object in the Text block. Only present in the JIIX export when export.jiix.text.chars or export.jiix.style are configured to true
last-char Index of the last character contained in this word. An integer, representing the index of a character object in the Text block Only present in the JIIX export when export.jiix.text.chars is configured to true

Example:

{
 "label": "hello",
 "candidates": [ "hello", "Hello", "hella", "bello", "Lello" ],
 "first-char": 0,
 "last-char": 4,
 "bounding-box": { ... },
 "items": [ ... ]
}

Character object

A character object represents the recognition of a character made by the MyScript engine. Note that to get such interpretation in JIIX export, your need to set the export.jiix.text.chars configuration option to true.

It has the following properties:

Property Description Content Note
label Recognition result associated with this char A string  
grid Highlight area associated with this char An array of 4 points, each containing x and y floating points coordinates  
bounding-box Extent of the character x, y, width, height - 4 numerical values defining a rectangle which upper-left corner is positioned at coordinates (x, y) and of size (width, height) Present in the JIIX export when export.jiix.bounding-box configuration is true
items Ink and/or glyphs composing the character An array of stroke and/or glyph items Strokes are only present in JIIX export when export.jiix.strokes is configured to true, glyphs are only present when export.jiix.glyphs is configured to true
word Index of the word that contains this char An integer only present in the JIIX export when export.jiix.text.words is configuredto true

Example:

{
  "label": "h",
  "word": 0,
  "grid": [ {
    "x": 18.875834,
    "y": 31.736748
   }, {
    "x": 25.118258,
    "y": 31.736748
   }, {
    "x": 25.118258,
    "y": 44.957951
   }, {
    "x": 18.875834,
    "y": 44.957951
   } ],
  "bounding-box": { ... },
  "items": [ ... ]
 }

Style

The JIIX format can contain styling information. These encompass:

  • CSS properties that you explicitly assign to the pen (dynamic styles)
  • Style classes that you assign to the pen (pen style classes)
  • Classes and styles automatically set by iink SDK when decorations are detected.
Themes, that are local to your editor, will not be exported.

If you are exporting content, you need to set the export.jiix.style configuration key to true to get style information.

Item span styling

Blocks like Drawing and text/non-text raw content items can be seen as an ordered collection of strokes. Such a collection can be styled via the definition of “item spans”, each span associating a specific style to a range of items.

Item spans have the following properties:

Property Description Content
first-item Index of the first item in the span A number (positive or null)
last-item Index of the last item in the span A number (positive or null)
class Name of the CSS class attached to the items in the span A string
style Inline CSS style that “overrides” any default style A string

For example, if we write 2 strokes with pen style class set to “greenThickPen” then 2 more strokes with no pen style class but pen style set to “color : #FF324233”, we obtain something like:

{
  "first-item": 0,
  "last-item": 1,
  "class": "greenThickPen"
}

and

{
 "first-item": 2,
 "last-item": 3,
 "style": "color: #FF324233"
}

Note that an item may be contain both class and style indications, or none of them if default styling applies.

Text span styling

Text blocks can be seen as an ordered collection of characters. Such a collection can be styled via the definition of “character spans”, each span associating a specific style to a range of characters.

Item spans have the following properties:

Property Description Content
first-char Index in the text of the first character in the span A number (positive or null)
last-char Index in the text of the last character in the span A number (positive or null)
class Name of the CSS class attached to the characters in the span A string
style Inline CSS style that “overrides” any default style A string

For example, text underlined by a gesture may get the following style:

{
 "first-char": 0,
 "last-char": 12,
 "class": "text-emphasis1",
 "style": "color: #000000FF; -myscript-text-decoration-color: #000000FF; -myscript-text-decoration-background-color: #FFED2666"
}

Nodes styling

Blocks like math and diagram nodes, as well as diagram connectors are independently styled.

They can directly have the following properties:

Property Description Content
class Name of the CSS class attached to the node A string
style Inline CSS style that “overrides” any default style for the node A string

For example, a math node can be styled as follows:

{
 "type": "number",
 "id": "math/170",
 "label": "3",
 "value": 3,
 "items": [ ... ],
 "bounding-box": { ... },
 "class": "greenThickPen"
}

Blocks

This section lists all available blocks of the hierarchy, their properties and particularities, if any.

Container block

A block of type Container groups children blocks together.

It has the following specific property:

Property Description Content
children List of blocks within this container block An array of blocks

For example, in the JIIX export of a “Text Document” part composed of two paragraphs of text, each paragraph will correspond to a text block and both will be grouped as the children of a same container block:

{
 "type": "Container",
 "id": "2135",
 "bounding-box": { ... },
 "children": [ {
   "type": "Text",
   ...
  }, {
   "type": "Text",
   ...
  } ],
 ...
}
No assumption is made about the type of children blocks.

Diagram block

A block of type Diagram groups together the different internal blocks of an individual diagram.

It has the following specific property:

Property Description Content
elements Array of recognized diagram items. An array of Diagram item blocks

For example, a diagram may be composed of a Text label and of a diagram Node corresponding to a rectangle:

{
 "type": "Diagram",
 "id": "9824",
 "bounding-box": { ... },
 "elements": [ {
   "type": "Text",
   ...
  }, {
   "type": "Node",
   "kind": "rectangle",
   ...
  } ],
 ...
}

Diagram item blocks

Diagram item blocks collectively form a family of blocks of different types describing the semantic structure of a diagram: connectors, text blocks, geometric shapes, etc. There is no actual “Diagram Item” type.

These blocks share the following common properties:

Property Description Content Note
type Diagram item type Node, Edge, Polyedge or Text  
parent Diagram item parent item (if any) A diagram item numerical id  
items Ink and/or converted shape primitives composing the item An array of stroke, line and/or arc items Strokes are only present in JIIX export when export.jiix.strokes is configured to true, lines and arcs are only present when export.jiix.primitives is configured to true

Diagram nodes and connectors (i.e. with type node, edge or polyedge) will get the following styling properties:

Property Description Content
class Name of the CSS class attached to the node A string
style Inline CSS style that “overrides” any default style for the node A string

Style is only present in then JIIX export when export.jiix.style is configured to true.

Example:

{
 "id": 97,
 "type": "Node",
 "parent": 12,
 "bounding-box": { ... },
 "items": [ ... ],
 ... specific properties ...
}
Although diagram item blocks have an id property like other blocks, their identifier is a number and not a string.

➤ Diagram Node block

A diagram item of type Node is associated with a particular shape, an optional label, and may host child items. This is modeled by the following properties:

Property Description Content
kind Diagram item Sub-type. rectangle, rhombus, polygon, circle, ellipse or doodle
label id of the diagram item of type Text that describes the label associated with the item. A diagram item numerical id
children Array of child diagram items associated with the item An array of diagram items numerical ids

Depending on its “kind”, the item will have specific properties:

  • If "kind": "rectangle"
    • x - X coordinate of the upper-left corner of the rectangle.
    • y - X coordinate of the upper-left corner of the rectangle.
    • width - Width of the rectangle.
    • height - Height of the rectangle.
  • If "kind": "rhombus"
    • points - Array containing the 4 {x, y} points describing the rhombus.
  • If "kind": "polygon"
    • points - Array of {x, y} points describing the polygon.
  • If "kind": "circle"
    • cx - X coordinate of the circle center.
    • cy - Y coordinate of the circle center.
    • r - Radius of the circle.
  • If "kind": "ellipse" : an axis aligned ellipse.
    • cx - X coordinate of the ellipse center.
    • cy - Y coordinate of the ellipse center.
    • rx - X radius of the ellipse.
    • ry - Y radius of the ellipse.
  • If "kind": "doodle"
    • No specific property describes a doodle.
    • Note: As doodles are not converted, items will never contain shape primitives.

For example, the following node represents a rectangle in a diagram, associated with a text label:

{
 "type": "Node",
 "kind": "rectangle",
 "label": 24,
 "children": [ 64, 72, 78 ],
 "id": 97,
 "bounding-box": { ... },
 "items": [ ... ],
 "x": 11.43108,
 "y": 21.065617,
 "width": 54.700756,
 "height": 18.451683
}

➤ Diagram Edge block

A diagram item of type Edge connects other diagram items.

Property Description Content Note
kind Connector sub-type line or arc  
children Array of children diagram items associated with the item An array of diagram items numerical ids  
connected List of the diagram items connected by this edge An array of diagram items numerical ids  
ports List of the connection ports associated with this edge A list of ports numerical ids  
p1Decoration Decoration of a “line” edge first point arrow-head in case an arrow head is present This property is absent if there is no decoration and only applies to “line” edges
p2Decoration Decorationof a “line” edge second point arrow-head in case an arrow head is present This property is absent if there is no decoration and only applies to “line” edges
startDecoration Decoration of an “arc” edge start point arrow-head in case an arrow head is present This property is absent if there is no decoration and only applies to “arc” edges
endDecoration Decoration of an “arc” edge end point arrow-head in case an arrow head is present This property is absent if there is no decoration and only applies to “arc” edges

Example of a “straight” edge:

{
 "type": "Edge",
 "kind": "line",
 "connected": [ 18, 30 ],
 "ports": [ 1, 0 ],
 "id": 8,
 "bounding-box": { ... },
 "items": [ ... ],
 "x1": 20.240625,
 "y1": 45.161953,
 "x2": 58.34063,
 "y2": 27.649166,
 "p2Decoration": "arrow-head"
}

Note that as a “line” connector, the edge includes x1, y1, x2 and y2 properties, defined the exact same way than in the case of line items.

Example of a “curved” edge:

{
 "type": "Edge",
 "kind": "arc",
 "id": 40,
 "bounding-box": { ... },
 "items": [ ... ],
 "connected": [ 30, 18 ],
 "ports": [ 0, 1 ],
 "cx": 47.004948,
 "cy": 50.038963,
 "rx": 33.323929,
 "ry": 33.323929,
 "phi": 0.0051990449,
 "startAngle": -2.9348991,
 "sweepAngle": 1.8149548
}

Note that as an “arc” connector, the edge includes cx, cy, rx, ry, phi, startAngle and sweepAngle properties, defined the exact same way than in the case of arc items.

➤ Diagram Polyedge block

A diagram item of type Polyedge connects other diagram items via several other edges. It is associated with the following properties:

Property Description Content
connected List of the diagram items connected by this polyedge An array of diagram items numerical ids.
edges List of edges composing this polyedge A list of diagram edge items

Example of a polyedge gathering three edges together:

{
 "type": "Edge",
 "kind": "polyedge",
 "id": 65,
 "connected": [ 19, 41, 8 ],
 "edges": [ {
   "type": "Edge",
   "kind": "line",
   ...
  }, {
   "type": "Edge",
   "kind": "line",
   ...
  }, {
   "type": "Edge",
   "kind": "line",
   ...
  } ]
}

➤ Diagram Text block

A diagram item of type Text combines the properties of a diagram item and those of a Text Block. It is styled using text spans.

Drawing block

A drawing block gathers raw digital ink.

It has the following specific properties:

Property Description Content Note
items Ink composing the block. An array of strokes items Strokes are present in JIIX export when export.jiix.strokes is configured to true
spans List of item spans providing styling information An array of item span objects Style is only present in then JIIX export when export.jiix.style is configured to true

Example:

{
 "type": "Drawing",
 "id": "7635",
 "bounding-box": { ... },
 "items": [ ... ],
 "spans": [ ... ]
}

Math block

A block of type Math is associated with the following property:

Property Description Content
expressions Array of recognized Math expressions. An array of math node blocks.
{
 "type": "Math",
 "id": "4529",
 "bounding-box": { ... },
 "expressions": [ ... ]
}

Math Node block

A math node block describes a portion of a mathematical expression. Depending on the math node type, a math node may contains other math nodes, in the operands property.

Property Description Content Note
type Node type A string Example: +, -, number, square root, see complete list
label Label associated with the node, when it is different from type A string Example: 2.453..., , θ, dx
operands Operands associated with the nodes, if any. An array of math nodes  
generated Signals that the node was added by the iink engine A boolean When not present this property is considered false
value Numerical value associated to a given node A number Not present when the iink SDK solver could not solve this particular node
items Ink and/or glyphs composing the node An array of stroke and/or glyph items Strokes are only present in JIIX export when export.jiix.strokes is configured to true, glyphs are only present when export.jiix.glyphs is configured to true
class Name of the CSS class attached to the node A string Style is only present in then JIIX export when export.jiix.style is configured to true
style Inline CSS style that “overrides” any default style for the node A string Style is only present in then JIIX export when export.jiix.style is configured to true

Example:

{
 "type": "+",
 "id": "math/34",
 "items": [ ... ],
 "bounding-box": { ... },
 "operands": [ ... ]
}

➤ Fence Math block

Math nodes of type fence have the following specific properties:

Property Description Content Examples
open symbol Opening symbol of the fence. If this property is not set, indicates that no opening symbol was recognized A string (, [, {
close symbol Closing symbol of the fence. If this property is not set, indicates that no closing symbol was recognized A string ), ], }

➤ Matrix Math block

Math nodes of type matrix have the following specific properties:

Property Description Content
rows Matrix content, row per row An array of cells objects, each representing a row of the matrix
cells Content of a row of the matrix An array of math nodes

➤ System Math block

Math nodes of type system have the following specific property:

Property Description Content
     
expressions Array of expressions within the system An array of math nodes

Text Block

A block of type Text has the following specific properties:

Property Description Content Note
label Recognition result associated with this text block A string Example: "label": "Hello how are you?"
words List of recognized words An array of word objects Words are only present in then JIIX export when export.jiix.text.words is configured to true
chars List of recognized characters An array of character objects Characters are only present in then JIIX export when export.jiix.text.chars is configured to true
spans List of text spans providing styling information An array of text span objects Style is only present in then JIIX export when export.jiix.style is configured to true

Example:

{
 "type": "Text",
 "id": "7666",
 "bounding-box": { ... },
 "label": "hello",
 "words": [ ... ],
 "chars": [ ... ],
 "spans": [ ... ]
}

Interactive Ink SDK differentiates explicit from implicit line breaks. An explicit line break is detected each time the writer goes back to the beginning of the next line but there was space to insert the word at the end of the previous line. An explicit line break is for instance preserved by reflow operations. An implicit line break corresponds to the case the user went to a new line after the previous one was fully filled (based on the view size).

For example, let’s assume that we write something that visually looks like:

Hello
there!
This is a bit more than a full
line

We will assume that the third line takes the full width of the view.

The corresponding JIIX export will look like:

{
 "type": "Text",
 "bounding-box": { ... },
 "label": "Hello\nthere!\nThis iis a bit more than a full\nline",
 "words": [ ... ],
 "linebreaks": [ {
   "line": 0
  }, {
   "line": 1
  } ],
 "version": "2",
 "id": "MainBlock"
}

Notice the three line breaks in the main label. Via the linebreaks property, the JIIX format explicits that the line breaks on line 0 and 1 (the first two lines) are explicit line breaks.

Raw Content block

A Raw Content block corresponds to the output of raw digital ink analysis. It is meant to express a segmentation between ink corresponding to text vs. ink corresponding to non-text, with optional interpretation as text and shape recognition results expressed as a hierarchy of diagram items.

A block of type Raw Content has the following specific property:

Property Description Content
elements Array of Raw Content items and/or Diagram items, depending on whether raw-content.recognition.text and raw-content.recognition.shape are set to true or false An array of Raw Content and/or Diagram items

Example:

{
  "type": "Raw Content",
  "id": "MainBlock",
  "bounding-box": { ... },
  "elements": [ ... ]
}

Raw Content item block

In addition to common block properties, raw content item blocks also have the following specific properties:

Property Description Content Note
kind Raw content item identified as representing “text” or “non-text” ink data text or non-text  
items Ink composing the block. An array of strokes items Strokes are present in JIIX export when export.jiix.strokes is configured to true

Example:

{
 "type": "Raw Content",
 "kind": "text",
 "id": 13,
 "bounding-box": { ... },
 "items": [ ... ]
}
Although raw content item blocks have an id property like other blocks, their identifier is a number and not a string.

Styling of a raw content item block is similar to Drawing for text and non-text blocks without the recognition enabled, otherwise it is similar as that of Diagram item blocks.

Math node complete overview

type operands other properties
number 0 label
symbol 0 label
group >=2  
+ >=1  
- >=1  
× (U+00D7: multiplication sign) >=1  
/ >=1  
÷ (U+00F7: division sign) >=1  
fraction 2  
power 1  
! 1  
percentage 2 (reference, percentage) operator:+, - or × (U+00D7: multiplication sign)
= 2  
> 2  
< 2  
(U+2248: almostEqualTo) 2  
(U+2243: asymptoticallyEqualTo) 2  
(U+2260: notEqualTo) 2  
(U+2261: identicalTo) 2  
(U+2262: notIdenticalTo) 2  
(U+2264: lessThanOrEqualTo) 2  
(U+2265: greaterThanOrEqualTo) 2  
(U+226A: muchLessThan) 2  
(U+226B: muchGreaterThan) 2  
(U+21D0: leftwardsDoubleArrow) 2  
(U+21D2: rightwardsDoubleArrow) 2  
(U+21D4: leftRightDoubleArrow) 2  
(U+2225: parallelTo) 2  
square root 1 (U+221A: square root)
system 0 expressions[node]
matrix 0 rows[cells]
rows 0 cells[node]
fence 1 open symbol, close symbol
underscript 2 (script, underscript)  
overscript 2 (script, overscript)  
underoverscript 3 (script, underscript, overscript)  
superscript 2 (script, superscript)  
subscript 2 (script, subscript)  
subsuperscript 3 (script, subscript, superscript)  
presuperscript 2 (script, presuperscript)  
presubscript 2 (script, presubscript)  
presubsuperscript 3 (script, presubscript, presuperscript)  
partialfractionnumerator 1 (numerator)  
partialfractiondenominator 1 (denominator)  
slantedfraction 2 (numerator, denominator)  

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