# Repeats, endings, and navigation

## Barlines

`|` is a plain barline, `||` a double barline, and `|||` a final barline.
Keep the pipes touching. Spaced `| |` includes an empty bar between two
barlines.

```scorescript
4C5 D E F || 1G |||
```

## Repeated sections

`|:` opens a repeat; `:|` closes it. The repeat sign already includes its
double-bar geometry. Do not add another double bar beside it. The checker
reports redundant pipes and the formatter removes them. `:|:` closes one
repeat where the next begins.

```scorescript
|: 4C5 D E F | 1G :|
```

## Repeat or borrow a measure

A measure containing only `&&` repeats the preceding bar and prints a simile
sign. `&&!` repeats it with the notes written out. `&&4` repeats four bars.
These forms must occupy a bar on their own and need earlier music to borrow.

```scorescript
4C5 D E F | && | &&! | &&2
```

`%` borrows the preceding bar as written-out notes. `%m1` borrows the
addressed earlier measure. This older form uses colon-addressed measure
lines; `%m1` is not accepted inside a modern nested `m2 { ... }` body.
For new range-based source, use [named range assignments](reuse.md).
The borrowed rhythm must fit the destination meter.

```scorescript
m1: 4C5 D E F
m2: %m1
```

## First and second endings

`[1..]` opens a first ending and `[2..]` the second. `[1,2..]` names several
passes. The closing repeat closes the first ending. A final ending can close
at an explicit double or final barline; without one it follows the length of
the ending it parallels.

```scorescript
4C5 D E F [1..] | 1G :| [2..] | 1C, |||
```

## Navigation words

Use bracketed musical instructions: `[segno]`, `[coda]`, `[to coda]`,
`[fine]`, `[D.C.]`, `[D.C. al Fine]`, or `[D.S. al Coda]`.
Navigation is case-insensitive and periods are optional: `[DC]`, `[dc]`, and
`[D.C.]` all mean da capo; `[DS]`, `[ds]`, and `[D.S.]` mean dal segno.
A deliberately named boxed label is `[[DC]]`, not a jump; prefer actual measure-number rehearsal
maps such as `RH {5, 9, 13}` for ordinary landmarks.

```scorescript
[segno] 4C5 D E F | 1G [fine]
```

Printed navigation and a playback itinerary are separate acceptance checks.
Inspect and listen to the finished work; do not assume that a renderer showing
an instruction proves every player follows its return path.