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LetterPatio

From approved document to delivered letter.

Connect document preparation, review and postal dispatch in one workflow. LetterPatio is a proposed service for correspondence that needs to leave the screen.

The Patio atlas

Inside LetterPatio.

Choose a topic or browse every data resource, capability and integration. Open an item to see what connects to it.

42items

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LetterPatio

Browse all items 42

1–18 of 42 items
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Related PatiosMailPatioInfraPatio

The catalog distinguishes upstream building blocks from proposed Patio connections. These are not live account bindings.

Inspect item

The workflow lab

See the records change.

Choose an incoming case and a recipient permission. Inspect the field mapping, the records kept and the exact handoff.

Fictional sample data

LetterPatio / Workflow

Build a reviewable letter from its source

Preserve document custody, attach a source citation and a selected address, and keep dispatch separate from preparation.

Recipient permissionSelected document context in MailPatio
Current resultOriginal → cited fragment → reviewable draft
3local records1immutable originals1source relationships
LetterPatio. Text document. Original → cited fragment → reviewable draft. Selected projection available. 4 Fields received.
01

Source records

What arrived, with its context

Uploaded invoice
document.acquisition
fileName
invoice-42.txt
content
Invoice INV-42 · EUR 84.00 Due: 2026-11-15
mediaType
text/plain; charset=utf-8
All fields & provenance7
sourceAccount
uploads:studio-demo
sourceObject
upload:u-42
contentIdentity
demo-content:c41
tenant
studio-demo

The acquired bytes and account-bound source relationship are separate evidence.

Selected recipient address
correspondence.address
recipient
Avery Sample
line1
14 Example Street
postalCode
75011
All fields & provenance5
city
Paris
country
FR

Fictional address entered for this letter; it is not inferred from the document.

02

Mapping & decisions

What changes, what stays separate

01Mapped
sourceObject + contentIdentityupload:u-42
originalReforiginal:invoice-42
Mapping rule

Preserve content once; bind every source separately.

02Retained
content / lines 1–2Invoice INV-42 · EUR 84.00 Due: 2026-11-15
citation.quoteInvoice INV-42 · EUR 84.00 Due: 2026-11-15
Mapping rule

UTF-8 extraction preserves the exact quotation.

03Mapped
selected.addressaddress:avery-sample
draft.contextRefaddress:avery-sample
Mapping rule

Only a successful extraction can support a cited draft.

Retain one immutable original
Why this decision?

Content identity is scoped to the tenant. A matching filename would not be enough to deduplicate.

Cite before drafting
Why this decision?

The draft references a specific source fragment rather than presenting extracted text as an original fact without evidence.

Linked contextdocument.citation → correspondence.draft
From
original:invoice-42
To
draft-42:v1
Scope
studio-demo · document_review
03

Resulting records

What this product keeps

Preserved original
knowledge.original-document
originalRef
original:invoice-42
immutable
true
sourceRelationships
1
All fields & provenance5
contentIdentity
demo-content:c41
readable
true

Deduplication saves one original; it does not combine account permissions.

Exact source citation
knowledge.document-citation
quote
Invoice INV-42 · EUR 84.00 Due: 2026-11-15
location
lines:1-2
originalRef
original:invoice-42
All fields & provenance4
extractionRef
extract:utf8:42

The quotation points to the original and this extraction run.

Cover letter draft
correspondence.letter-draft
subject
Document for review: INV-42
body
Please review the enclosed invoice INV-42 for EUR 84.00, due 15 November 2026.
sourceCitation
citation-42
All fields & provenance7
draftId
draft-42:v1
contextRef
address:avery-sample
reviewed
false
deliveryState
not_sent

A reviewable letter is prepared. This source inventory supplies no postal carrier dispatch.

Typed handoff

LetterPatioMailPatio

document.review-projection.v1
Selected projection available
Fields received
originalRef
original:invoice-42
citationRef
citation-42
excerpt
Invoice INV-42 · EUR 84.00
purpose
document_review
Remain outside this handoff
emailBodyallAttachmentsaccountCredentialsunrelatedDocuments

Only these selected fields cross into the receiving product.

Sample grantdemo-grant:letterpatio:mailpatio:document.review-projection.v1
Inspect the rules and source foundations4

One original, explicit recipient address and document-review purpose. Postal transport remains a separate proposed integration.

ContractSpec supplies the cited building blocks. This end-to-end recipe is a proposed Patio composition; its fixture decisions do not run those services.

Immutable document custody and per-source provenanceUTF-8 extraction and explicit PDF/OCR portsOriginal documents, fragments and citationsField-scoped authorization before projection

A local simulation. No account is connected and no message, publication or deployment is sent.