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schemas/invoice.json

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+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "german-ocr-3/schemas/invoice.json",
+  "title": "GermanOCR3 Invoice (Rechnung)",
+  "description": "Schema fuer deutsche Rechnungen. Pflichtangaben gemaess UStG § 14 sind beruecksichtigt; nicht erkennbare Felder bleiben null.",
+  "type": "object",
+  "additionalProperties": false,
+  "required": ["document_type", "language", "invoice_number", "invoice_date", "amount_total", "currency"],
+  "properties": {
+    "document_type": {"const": "invoice"},
+    "language": {"type": "string", "default": "de"},
+
+    "invoice_number": {"type": ["string", "null"]},
+    "invoice_date": {
+      "description": "Rechnungsdatum YYYY-MM-DD",
+      "type": ["string", "null"]
+    },
+    "delivery_date": {
+      "description": "Liefer-/Leistungsdatum YYYY-MM-DD",
+      "type": ["string", "null"]
+    },
+    "due_date": {
+      "description": "Faelligkeitsdatum YYYY-MM-DD",
+      "type": ["string", "null"]
+    },
+
+    "sender": {
+      "type": ["object", "null"],
+      "additionalProperties": false,
+      "properties": {
+        "name": {"type": ["string", "null"]},
+        "address": {"type": ["string", "null"]},
+        "email": {"type": ["string", "null"]},
+        "phone": {"type": ["string", "null"]},
+        "tax_id": {"description": "Steuernummer", "type": ["string", "null"]},
+        "vat_id": {"description": "USt-IdNr / VAT ID (DE...)", "type": ["string", "null"]},
+        "iban": {"type": ["string", "null"]},
+        "bic": {"type": ["string", "null"]},
+        "bank": {"type": ["string", "null"]}
+      }
+    },
+    "recipient": {
+      "type": ["object", "null"],
+      "additionalProperties": false,
+      "properties": {
+        "name": {"type": ["string", "null"]},
+        "address": {"type": ["string", "null"]},
+        "customer_id": {"type": ["string", "null"]},
+        "vat_id": {"type": ["string", "null"]}
+      }
+    },
+
+    "line_items": {
+      "type": "array",
+      "default": [],
+      "items": {
+        "type": "object",
+        "additionalProperties": false,
+        "required": ["description", "amount_net"],
+        "properties": {
+          "position": {"type": ["integer", "null"]},
+          "article_number": {"type": ["string", "null"]},
+          "description": {"type": "string"},
+          "quantity": {"type": ["number", "null"]},
+          "unit": {"type": ["string", "null"]},
+          "unit_price_net": {"type": ["number", "null"]},
+          "amount_net": {"type": ["number", "null"]},
+          "vat_rate": {"description": "Prozent, z.B. 19 oder 7", "type": ["number", "null"]}
+        }
+      }
+    },
+
+    "amount_net": {"type": ["number", "null"]},
+    "amount_vat": {"type": ["number", "null"]},
+    "amount_total": {"type": ["number", "null"]},
+    "currency": {
+      "type": ["string", "null"],
+      "description": "ISO-4217, typisch EUR"
+    },
+
+    "vat_breakdown": {
+      "type": "array",
+      "default": [],
+      "items": {
+        "type": "object",
+        "additionalProperties": false,
+        "required": ["rate", "net", "vat"],
+        "properties": {
+          "rate": {"type": "number"},
+          "net": {"type": "number"},
+          "vat": {"type": "number"}
+        }
+      }
+    },
+
+    "payment_terms": {"type": ["string", "null"]},
+    "notes": {"type": "array", "items": {"type": "string"}, "default": []},
+    "raw_text": {"type": ["string", "null"]},
+    "confidence": {"type": ["number", "null"], "minimum": 0, "maximum": 1}
+  }
+}