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docs(spec): print-template row filtering (filter/match) #3

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docs(spec): print-template row filtering (filter/match) #3

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23 changes: 23 additions & 0 deletions docs/spec/presentation.md
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Original file line number Diff line number Diff line change
Expand Up @@ -158,6 +158,29 @@ The template is a tree of layout tags (`page`, `header` / `footer`, `section` /
{{<Property>}} a line-item field (inside a table bound to the items)
```

A `table` (or a row-expanding `for`) can **filter** the collection it renders — a declarative value match, never an expression: `filter="<path>"` keeps the rows whose path (resolved per row) is truthy, and adding `match="A | B"` keeps only the rows whose value equals one of the `|`-separated literals. The same `match` on an `if` compares its resolved `source` against the listed values instead of testing truthiness. One bound collection can this way render into several purpose-grouped tables — the two-column payslip (earnings left, deductions right), a journal entry's debit and credit sides, a VAT summary per rate:

```text
<row gap="16">
<stack>
<text style="subtitle">Earnings</text>
<table source="items" filter="Kind" match="BASE | ENTRY">
<column width="3*" label="Earning">{{Name}}</column>
<column width="*" align="right" label="Amount">{{Amount}}</column>
</table>
</stack>
<stack>
<text style="subtitle">Deductions</text>
<table source="items" filter="Kind" match="CONTRIBUTION | TAX">
<column width="3*" label="Deduction">{{Name}}</column>
<column width="*" align="right" label="Amount">{{Amount}}</column>
</table>
</stack>
</row>
```

A generator that predates the attributes ignores them and renders all rows — a filtered template never fails on an older platform.

::: info Normative
The print template is written **create-if-absent** and never regenerated over. A printed document is a formatted, audited artefact you adapt by hand, and a newly added model field must not silently appear on an already-designed document.
:::
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