`examples/graphic-crescent-and-star.umsg`

%unimsg 0 graphic/crescent-and-star/v0 · 74 lines · 1793 bytes of text · 1220 bytes canonical · the raw file

Point at anything below — a sigil, a literal, a brace — and the card says what it is. Keyboard: tab through the document. Every explanation is also printed in full beneath the source.

%unimsg 0 graphic/crescent-and-star/v0

graphic {
  at          2026-08-25
  precision   { coordinate 0.0001, rounding :half-even }
  space       { height 200, unit :user, width 200, y-axis :down }
  status      :draft
  title       "Crescent and star"
  description "A waxing crescent opening to the right, with a five-pointed\r
               star set in its opening. Both are filled with the same gold\r
               ramp, running from pale at the upper left to deep at the lower\r
               right."
  paints      {
    gold-tight {
      from { x 128, y 50 }
      kind :linear
      ramp -> @ramps.gold
      to   { x 168, y 94 }
    }
    gold-wide  {
      from { x 40, y 40 }
      kind :linear
      ramp -> @ramps.gold
      to   { x 160, y 160 }
    }
  }
  ramps       {
    gold [
      | at  colour    opacity
      | 0   "#dfc595" 1
      | 0.5 "#c7983c" 1
      | 1   "#bf7c26" 1
    ]
  }
  scene       [
    {
      ops    ^u8 [ 0, 4, 4, 5 ]
      role   :path
      style  -> @styles.crescent
      coords ^i32 [
        1000000, 400000, 600000, 600000, 0, 10000, 0, 1000000, 1600000, 500000
        500000, 0, 10000, 10000, 1000000, 400000
      ]
    }
    {
      role   :polygon
      style  -> @styles.star
      points [
        | x        y
        | 148      46
        | 154.113  63.5862
        | 172.7275 63.9656
        | 157.891  75.2138
        | 163.2824 93.0344
        | 148      82.4
        | 132.7176 93.0344
        | 138.109  75.2138
        | 123.2725 63.9656
        | 141.887  63.5862
      ]
    }
  ]
  styles      {
    crescent {
      fill   { paint -> @paints.gold-wide }
      stroke { paint "#8a5a1c", width 1.5 }
    }
    star     {
      fill   { paint -> @paints.gold-tight }
      stroke { paint "#8a5a1c", width 1 }
    }
  }
}

The canonical encoding

Produced by the reference encoder when this page was built. Decoding these bytes and printing them in the text form returns the document above, byte for byte — that round trip is the claim the whole format rests on.

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canonical CBOR for examples/graphic-crescent-and-star.umsg 1220 bytes

Every construct on this page

The formal columns are read from the specification when this page is generated. The last column is this site's plain-language gloss and is not normative — where they differ, the specification is right.

construct	glyph	carries	example	gloss
:annotation	—	—	—	A bare name qualifying the value after it—for example a language tag or a unit such as `kg`. It is not a value itself; a bare name with nothing after it is an error, not a guess.
:array	`^`	type, or type:shape; then [ elements ]	`^f64 [ 1.5, 2.5 ] or ^i16:2x3 [ … ]`	A packed, homogeneous numeric array. The `^` marker gives every element its type and may also give the row-major shape: `^f64:2x3 [ … ]`.
:array-element	—	—	—	One element of a typed array. Its type comes from the `^` marker, so `1.5` inside `^f64` is binary64 rather than an exact decimal.
:array-missing	—	—	—	A missing position in a typed array. `null` here is not an element value: it adds a validity mask while preserving the array's shape.
:block	—	—	—	A block: named pairs, in braces. Its keys are sorted in the encoding and shown here as written.
:bytes	`~`	encoding:data	`~hex:ff00 or ~b64:iVBORw0KGgo=`	Raw octets, carried as octets. No base64 tax, no pretending they are text.
:comment	`--`	to end of line	`-- a note`	A note for people. It travels with the pair it precedes and never reaches the bytes.
:decimal	—	—	—	An exact decimal. 19.99 is nineteen and ninety-nine hundredths, not the nearest double to it.
:extension	`!`	name, then value	`!acme/hint { zone 4 }`	A qualifier this reader may not know. It survives the round trip intact, and stays legible on the way past — the rule that separates an extension from a private convention.
:float	—	—	—	A binary float, marked so it can never be mistaken for the exact decimal beside it.
:hash	`#`	algorithm:hex	`#sha256:deadbeef`	The digest of some content, with the algorithm said out loud so it is still meaningful in ten years.
:header	`%`	unimsg only	`%unimsg 0 label`	Declares the format version and what this document is. Optional, and useful exactly when a file arrives without context.
:identifier	`@`	word	`@ord-88213`	Gives this value a name, so another document can point at it without copying it.
:integer	—	—	—	A whole number of any size. Past 2^53 it is still exact, which is the whole reason this is not JSON.
:key	—	—	—	A field name: the first thing in a pair. It is bare when possible and quoted when needed, and names the content without becoming part of the value.
:reference	`->`	an identifier or a path	`-> @cust-4471, -> @lexicon.entries.kitāb`	Points at a name. Nothing follows it while reading — resolution is somebody else's job, deliberately.
:reserved-literal	—	—	—	One of six bare words that are values rather than names. The list is fixed, so no value is coerced by what it looks like.
:sequence	—	—	—	An ordered list. Order is preserved and is meaning.
:string	—	—	—	Text. May span lines, so prose does not have to be escaped into one.
:symbol	`:`	word	`:dispatched`	A name from a fixed vocabulary, not free text. `:high` is a value someone chose; "high" is a phrase someone typed.
:table-row	`\|`	cells	`\| sku qty`	One record of a table. A table is sugar for a sequence of blocks with the same keys, and encodes identically to the longhand.
:timestamp	—	—	—	A temporal value at the precision written. `2026-08` stays a month, and `03:52` stays a wall-clock time; neither is widened into an invented instant.