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skills/minimax-xlsx/references/create.md
shihao 6487becf60 Initial commit: add all skills files 
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-10 16:52:49 +08:00

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Build New xlsx from Scratch

Create new, production-quality xlsx files using the XML approach. NEVER use openpyxl for writing. NEVER hardcode Python-computed values — every derived number must be a live Excel formula.

When to Use This Path

Use this document when the user wants:

  • A brand-new Excel file that does not yet exist
  • A generated report, financial model, or data table
  • Any "create / build / generate / make" request

If the user provides an existing file to modify, switch to edit.md instead.

The Non-Negotiable Rules

Before touching any file, internalize these four rules:

  1. Formula-First: Every calculated value (SUM, growth rate, ratio, subtotal, etc.) MUST be written as <f>SUM(B2:B9)</f>, not as a hardcoded <v>5000</v>. Hardcoded numbers go stale when source data changes. Only raw inputs and assumption parameters may be hardcoded values.

  2. No openpyxl for writing: The entire file is built by editing XML directly. Python is only allowed for reading/analysis (pandas.read_excel()) and for running helper scripts (xlsx_pack.py, formula_check.py).

  3. Style encodes meaning: Blue font = user input/assumption. Black font = formula result. Green font = cross-sheet reference. See format.md for the full color system and style index table.

  4. Validate before delivery: Run formula_check.py and fix all errors before handing the file to the user.

Complete Creation Workflow

Step 1 — Plan Before Writing

Define the full structure on paper before touching any XML:

  • Sheets: names, order, purpose (e.g., Assumptions / Model / Summary)
  • Layout per sheet: which rows are headers, inputs, formulas, totals
  • String inventory: collect all text labels you will need in sharedStrings
  • Style choices: what number format each column needs (currency, %, integer, year)
  • Cross-sheet links: which sheets pull data from other sheets

This planning step prevents the costly cycle of adding strings to sharedStrings mid-way and recomputing all indices.

Step 2 — Copy Minimal Template

cp -r SKILL_DIR/templates/minimal_xlsx/ /tmp/xlsx_work/

The template gives you a complete, valid 7-file xlsx skeleton:

/tmp/xlsx_work/
├── [Content_Types].xml        ← MIME type registry
├── _rels/
│   └── .rels                  ← root relationship (points to workbook.xml)
└── xl/
    ├── workbook.xml            ← sheet list and calc settings
    ├── styles.xml              ← 13 pre-built financial style slots
    ├── sharedStrings.xml       ← text string table (starts empty)
    ├── _rels/
    │   └── workbook.xml.rels  ← maps rId → file paths
    └── worksheets/
        └── sheet1.xml          ← one empty sheet

After copying, rename sheets and add content. Do not create files from scratch — always start from the template.

Step 3 — Configure Sheet Structure

Single-Sheet Workbook

The template already has one sheet named "Sheet1". Just change the name attribute in xl/workbook.xml:

<sheets>
  <sheet name="Revenue Model" sheetId="1" r:id="rId1"/>
</sheets>

No other files need to change for a single-sheet workbook.

Multi-Sheet Workbook

Four files must be kept in sync. Work through them in this order:

IMPORTANT — rId collision rule: In the template's workbook.xml.rels, the IDs rId1, rId2, and rId3 are already taken:

  • rId1 → worksheets/sheet1.xml
  • rId2 → styles.xml
  • rId3 → sharedStrings.xml

New worksheet entries MUST start at rId4 and count upward.

File 1 of 4 — xl/workbook.xml (sheet list):

<sheets>
  <sheet name="Assumptions" sheetId="1" r:id="rId1"/>
  <sheet name="Model"       sheetId="2" r:id="rId4"/>
  <sheet name="Summary"     sheetId="3" r:id="rId5"/>
</sheets>

Special characters in sheet names:

  • & → &amp; in XML: <sheet name="P&amp;L" .../>
  • Max 31 characters
  • Forbidden: / \ ? * [ ] :
  • Sheet names with spaces need single quotes in formula references: 'Q1 Data'!B5

File 2 of 4 — xl/_rels/workbook.xml.rels (ID → file mapping):

<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
  <Relationship Id="rId1"
    Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"
    Target="worksheets/sheet1.xml"/>
  <Relationship Id="rId2"
    Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"
    Target="styles.xml"/>
  <Relationship Id="rId3"
    Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/sharedStrings"
    Target="sharedStrings.xml"/>
  <Relationship Id="rId4"
    Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"
    Target="worksheets/sheet2.xml"/>
  <Relationship Id="rId5"
    Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"
    Target="worksheets/sheet3.xml"/>
</Relationships>

File 3 of 4 — [Content_Types].xml (MIME type declarations):

<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
  <Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>
  <Default Extension="xml"  ContentType="application/xml"/>
  <Override PartName="/xl/workbook.xml"
    ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml"/>
  <Override PartName="/xl/worksheets/sheet1.xml"
    ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/>
  <Override PartName="/xl/worksheets/sheet2.xml"
    ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/>
  <Override PartName="/xl/worksheets/sheet3.xml"
    ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/>
  <Override PartName="/xl/styles.xml"
    ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.styles+xml"/>
  <Override PartName="/xl/sharedStrings.xml"
    ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sharedStrings+xml"/>
</Types>

File 4 of 4 — Create new worksheet XML files

Copy sheet1.xml to sheet2.xml and sheet3.xml, then clear the <sheetData> content:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<worksheet
  xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"
  xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">
  <sheetViews>
    <sheetView workbookViewId="0"/>
  </sheetViews>
  <sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"
    xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"/>
  <sheetData>
    <!-- Data rows go here -->
  </sheetData>
  <pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/>
</worksheet>

Sync checklist — every time you add a sheet, verify all four are consistent:

Check What to verify
workbook.xml New <sheet name="..." sheetId="N" r:id="rIdX"/> exists
workbook.xml.rels New <Relationship Id="rIdX" ... Target="worksheets/sheetN.xml"/> exists
[Content_Types].xml New <Override PartName="/xl/worksheets/sheetN.xml" .../> exists
Filesystem xl/worksheets/sheetN.xml file actually exists

Step 4 — Populate sharedStrings

All text values (headers, row labels, category names, any string the user will read) must be stored in xl/sharedStrings.xml. Cells reference them by 0-based index.

Recommended workflow: collect ALL text you need first, write the complete table once, then fill in indices while writing worksheet XML. This avoids re-counting indices mid-way.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<sst xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"
     count="10" uniqueCount="10">
  <si><t>Item</t></si>                  <!-- index 0 -->
  <si><t>FY2023A</t></si>               <!-- index 1 -->
  <si><t>FY2024E</t></si>               <!-- index 2 -->
  <si><t>FY2025E</t></si>               <!-- index 3 -->
  <si><t>YoY Growth</t></si>            <!-- index 4 -->
  <si><t>Revenue</t></si>               <!-- index 5 -->
  <si><t>Cost of Goods Sold</t></si>    <!-- index 6 -->
  <si><t>Gross Profit</t></si>          <!-- index 7 -->
  <si><t>EBITDA</t></si>                <!-- index 8 -->
  <si><t>Net Income</t></si>            <!-- index 9 -->
</sst>

Attribute rules:

  • uniqueCount = number of <si> elements (unique strings in the table)
  • count = total number of cell references to strings across the entire workbook (if "Revenue" appears in 3 sheets, count is uniqueCount + 2)
  • For new files where each string appears once, count == uniqueCount
  • Both attributes MUST be accurate — wrong values trigger warnings in some Excel versions

Special character escaping:

<si><t>R&amp;D Expenses</t></si>          <!-- & must be &amp; -->
<si><t>Revenue &lt; Target</t></si>        <!-- < must be &lt; -->
<si><t xml:space="preserve">  (note)  </t></si>  <!-- preserve leading/trailing spaces -->

Helper script: use shared_strings_builder.py to generate the complete sharedStrings.xml from a plain list of strings:

python3 SKILL_DIR/scripts/shared_strings_builder.py \
  "Item" "FY2024" "FY2025" "Revenue" "Gross Profit" \
  > /tmp/xlsx_work/xl/sharedStrings.xml

Or interactively from a file listing one string per line:

python3 SKILL_DIR/scripts/shared_strings_builder.py --file strings.txt \
  > /tmp/xlsx_work/xl/sharedStrings.xml

Step 5 — Write Worksheet Data

Edit each xl/worksheets/sheetN.xml. Replace the empty <sheetData> with rows and cells.

Cell XML Anatomy

<c r="B5" t="s" s="4">
      ↑     ↑    ↑
   address  type  style index (from cellXfs in styles.xml)

  <v>3</v>
     ↑
  value (for t="s": sharedStrings index; for numbers: the number itself)

Data Type Reference

Data t attr XML Example Notes
Shared string (text) s <c r="A1" t="s" s="4"><v>0</v></c> <v> = sharedStrings index
Number omit <c r="B2" s="5"><v>1000000</v></c> default type, t omitted
Percentage (as decimal) omit <c r="C2" s="7"><v>0.125</v></c> 12.5% stored as 0.125
Boolean b <c r="D1" t="b"><v>1</v></c> 1=TRUE, 0=FALSE
Formula omit <c r="B4" s="2"><f>SUM(B2:B3)</f><v></v></c> <v> left empty
Cross-sheet formula omit <c r="C1" s="3"><f>Assumptions!B2</f><v></v></c> use s=3 (green)

A Full Sheet Data Example

<cols>
  <col min="1" max="1" width="26" customWidth="1"/>   <!-- A: label column -->
  <col min="2" max="5" width="14" customWidth="1"/>   <!-- B-E: data columns -->
</cols>
<sheetData>

  <!-- Row 1: headers (style 4 = bold header) -->
  <row r="1" ht="18" customHeight="1">
    <c r="A1" t="s" s="4"><v>0</v></c>   <!-- "Item" -->
    <c r="B1" t="s" s="4"><v>1</v></c>   <!-- "FY2023A" -->
    <c r="C1" t="s" s="4"><v>2</v></c>   <!-- "FY2024E" -->
    <c r="D1" t="s" s="4"><v>3</v></c>   <!-- "FY2025E" -->
    <c r="E1" t="s" s="4"><v>4</v></c>   <!-- "YoY Growth" -->
  </row>

  <!-- Row 2: Revenue — actual value (input) + formula (computed) -->
  <row r="2">
    <c r="A2" t="s" s="1"><v>5</v></c>    <!-- "Revenue", blue input label -->
    <c r="B2" s="5"><v>85000000</v></c>   <!-- FY2023A actual: $85M, currency input -->
    <c r="C2" s="6"><f>B2*(1+Assumptions!C3)</f><v></v></c>   <!-- formula, currency -->
    <c r="D2" s="6"><f>C2*(1+Assumptions!D3)</f><v></v></c>
    <c r="E2" s="8"><f>D2/C2-1</f><v></v></c>   <!-- YoY growth, percentage formula -->
  </row>

  <!-- Row 3: Gross Profit -->
  <row r="3">
    <c r="A3" t="s" s="2"><v>7</v></c>    <!-- "Gross Profit", black formula label -->
    <c r="B3" s="6"><f>B2*Assumptions!B4</f><v></v></c>
    <c r="C3" s="6"><f>C2*Assumptions!C4</f><v></v></c>
    <c r="D3" s="6"><f>D2*Assumptions!D4</f><v></v></c>
    <c r="E3" s="8"><f>D3/C3-1</f><v></v></c>
  </row>

  <!-- Row 5: SUM total row -->
  <row r="5">
    <c r="A5" t="s" s="4"><v>8</v></c>    <!-- "EBITDA" -->
    <c r="B5" s="6"><f>SUM(B2:B4)</f><v></v></c>
    <c r="C5" s="6"><f>SUM(C2:C4)</f><v></v></c>
    <c r="D5" s="6"><f>SUM(D2:D4)</f><v></v></c>
    <c r="E5" s="8"><f>D5/C5-1</f><v></v></c>
  </row>

</sheetData>

Column Width and Freeze Pane

Column widths go before <sheetData>, freeze pane goes inside <sheetView>:

<!-- Inside <sheetViews><sheetView ...> — freeze the header row -->
<pane ySplit="1" topLeftCell="A2" activePane="bottomLeft" state="frozen"/>

<!-- Before <sheetData> — set column widths -->
<cols>
  <col min="1" max="1" width="28" customWidth="1"/>
  <col min="2" max="8" width="14" customWidth="1"/>
</cols>

Step 6 — Apply Styles

The template's xl/styles.xml has 13 pre-built semantic style slots (indices 0–12). Read format.md for the complete style index table, color system, and how to add new styles.

Quick reference for the most common slots:

s Role Example
4 Header (bold) Column/row titles
5 / 6 Currency input (blue) / formula (black) $#,##0
7 / 8 Percentage input / formula 0.0%
11 Year (no comma) 2024 not 2,024

Design principle: Blue = human sets this. Black = Excel computes this. Green = cross-sheet.

If you need a style not in the 13 pre-built slots, follow the append-only procedure in format.md section 3.2.

Step 7 — Formula Cookbook

XML Formula Syntax Reminder

Formulas in XML have no leading =:

<!-- Excel UI: =SUM(B2:B9)   →   XML: -->
<c r="B10" s="6"><f>SUM(B2:B9)</f><v></v></c>

Basic Aggregations

<c r="B10" s="6"><f>SUM(B2:B9)</f><v></v></c>
<c r="B11" s="6"><f>AVERAGE(B2:B9)</f><v></v></c>
<c r="B12" s="10"><f>COUNT(B2:B9)</f><v></v></c>
<c r="B13" s="10"><f>COUNTA(A2:A100)</f><v></v></c>
<c r="B14" s="6"><f>MAX(B2:B9)</f><v></v></c>
<c r="B15" s="6"><f>MIN(B2:B9)</f><v></v></c>

Financial Calculations

<!-- YoY growth rate: current / prior - 1 -->
<c r="E5" s="8"><f>D5/C5-1</f><v></v></c>

<!-- Gross profit: revenue × gross margin -->
<c r="B6" s="6"><f>B4*B3</f><v></v></c>

<!-- EBITDA margin: EBITDA / Revenue -->
<c r="B9" s="8"><f>B8/B4</f><v></v></c>

<!-- Suppress #DIV/0! when denominator may be zero -->
<c r="E5" s="8"><f>IF(C5=0,0,D5/C5-1)</f><v></v></c>

<!-- NPV and IRR (cash flows in B2:B7, discount rate in B1) -->
<c r="C1" s="6"><f>NPV(B1,B3:B7)+B2</f><v></v></c>
<c r="C2" s="8"><f>IRR(B2:B7)</f><v></v></c>

Cross-Sheet References

<!-- No spaces in name: no quotes needed -->
<c r="B3" s="3"><f>Assumptions!B5</f><v></v></c>

<!-- Space in sheet name: single quotes required -->
<c r="B3" s="3"><f>'Q1 Data'!B5</f><v></v></c>

<!-- Ampersand in sheet name (XML-escaped in workbook.xml, but in formula: literal &) -->
<c r="B3" s="3"><f>'R&amp;D'!B5</f><v></v></c>

<!-- Cross-sheet range: SUM of a range in another sheet -->
<c r="B10" s="6"><f>SUM(Data!C2:C1000)</f><v></v></c>

<!-- 3D reference: sum same cell across multiple sheets -->
<c r="B5" s="6"><f>SUM(Jan:Dec!B5)</f><v></v></c>

Cross-sheet formula cells should use s="3" (green) to signal the data origin.

Shared Formulas (Same Pattern Repeated Down a Column)

When many consecutive cells share the same formula structure with only the row number changing, use shared formulas to keep the XML compact:

<!-- D2: defines the shared group (si="0", ref="D2:D11") -->
<c r="D2" s="8"><f t="shared" ref="D2:D11" si="0">C2/B2-1</f><v></v></c>

<!-- D3 through D11: reference the same group, no formula text needed -->
<c r="D3" s="8"><f t="shared" si="0"/><v></v></c>
<c r="D4" s="8"><f t="shared" si="0"/><v></v></c>
<c r="D5" s="8"><f t="shared" si="0"/><v></v></c>
<c r="D6" s="8"><f t="shared" si="0"/><v></v></c>
<c r="D7" s="8"><f t="shared" si="0"/><v></v></c>
<c r="D8" s="8"><f t="shared" si="0"/><v></v></c>
<c r="D9" s="8"><f t="shared" si="0"/><v></v></c>
<c r="D10" s="8"><f t="shared" si="0"/><v></v></c>
<c r="D11" s="8"><f t="shared" si="0"/><v></v></c>

Excel adjusts relative references automatically (D3 computes C3/B3-1, etc.). If you have multiple shared formula groups, assign sequential si values (0, 1, 2, …).

Absolute References

<!-- $B$2 locks to that cell when the formula is copied -->
<c r="C5" s="8"><f>B5/$B$2</f><v></v></c>

The $ character needs no XML escaping — write it literally.

Lookup Formulas

<!-- VLOOKUP: exact match (last arg 0) -->
<c r="C5" s="6"><f>VLOOKUP(A5,Assumptions!A:C,2,0)</f><v></v></c>

<!-- INDEX/MATCH: more flexible -->
<c r="C5" s="6"><f>INDEX(B:B,MATCH(A5,A:A,0))</f><v></v></c>

<!-- XLOOKUP (Excel 2019+) -->
<c r="C5" s="6"><f>XLOOKUP(A5,A:A,B:B)</f><v></v></c>

Step 8 — Pack and Validate

Pack:

python3 SKILL_DIR/scripts/xlsx_pack.py /tmp/xlsx_work/ /path/to/output.xlsx

xlsx_pack.py will:

  1. Check that [Content_Types].xml exists at the root
  2. Parse every .xml and .rels file for well-formedness — abort if any fail
  3. Create the ZIP archive with correct compression

Validate:

python3 SKILL_DIR/scripts/formula_check.py /path/to/output.xlsx

formula_check.py will:

  1. Scan every cell for <c t="e"> entries (cached error values) — all 7 error types
  2. Extract sheet name references from every <f> formula
  3. Verify each referenced sheet exists in workbook.xml

Fix every reported error before delivery. Exit code 0 = safe to deliver.

Pre-Delivery Checklist

Run through this list before handing the file to the user:

  • formula_check.py reports 0 errors
  • Every calculated cell has <f> — not just <v> with a number
  • sharedStrings.xml count and uniqueCount match actual <si> count
  • Every cell s attribute value is in range 0 to cellXfs count - 1
  • Every sheet in workbook.xml has a matching entry in workbook.xml.rels
  • Every worksheets/sheetN.xml file has a matching <Override> in [Content_Types].xml
  • Year columns use s="11" (format 0, no thousands separator)
  • Cross-sheet reference formulas use s="3" (green font)
  • Assumption inputs use s="1" or s="5" or s="7" (blue font)

Common Mistakes and Fixes

Mistake Symptom Fix
Formula has leading = Cell shows =SUM(...) as text Remove = from <f> content
sharedStrings count not updated Excel warning or blank cells Count <si> elements, update both count and uniqueCount
Style index out of range File corruption / Excel repair Ensure s < cellXfs count; append new <xf> if needed
New sheet rId conflicts with styles/sharedStrings rId Sheet missing or styles lost New sheets use rId4, rId5, … (rId1-3 are reserved in template)
Sheet name has & unescaped in XML XML parse error Use &amp; in workbook.xml name attribute
Cross-sheet ref to sheet with space, no quotes #REF! error Wrap sheet name in single quotes: 'Sheet Name'!B5
Cross-sheet ref to non-existent sheet #REF! error Check workbook.xml sheet list vs formula
Number stored as text (t="s") Left-aligned, can't sum Remove t attribute from number cells
Year displayed as 2,024 Readability issue Use s="11" (numFmtId=1, format 0)
Hardcoded Python result instead of formula "Dead table" — won't update Replace <v>N</v> with <f>formula</f><v></v>

Column Letter Reference

Col # Letter Col # Letter Col # Letter
1 A 26 Z 27 AA
28 AB 52 AZ 53 BA
54 BB 78 BZ 79 CA

Python conversion (use when building formulas programmatically):

def col_letter(n: int) -> str:
    """Convert 1-based column number to Excel letter (A, B, ..., Z, AA, AB, ...)."""
    result = ""
    while n > 0:
        n, rem = divmod(n - 1, 26)
        result = chr(65 + rem) + result
    return result

def col_number(s: str) -> int:
    """Convert Excel column letter to 1-based number."""
    n = 0
    for c in s.upper():
        n = n * 26 + (ord(c) - 64)
    return n

Typical Scenario Walkthroughs

Scenario A — Three-Year Financial Model (Single Sheet)

Layout: rows 1-12 = Assumptions (blue inputs) / rows 14-30 = Model (black formulas).

<!-- sharedStrings.xml (excerpt) -->
<sst count="8" uniqueCount="8">
  <si><t>Metric</t></si>           <!-- 0 -->
  <si><t>FY2023A</t></si>          <!-- 1 -->
  <si><t>FY2024E</t></si>          <!-- 2 -->
  <si><t>FY2025E</t></si>          <!-- 3 -->
  <si><t>Revenue Growth</t></si>   <!-- 4 -->
  <si><t>Gross Margin</t></si>     <!-- 5 -->
  <si><t>Revenue</t></si>          <!-- 6 -->
  <si><t>Gross Profit</t></si>     <!-- 7 -->
</sst>

<!-- sheet1.xml (excerpt) -->
<sheetData>
  <!-- Header -->
  <row r="1">
    <c r="A1" t="s" s="4"><v>0</v></c>
    <c r="B1" t="s" s="4"><v>1</v></c>
    <c r="C1" t="s" s="4"><v>2</v></c>
    <c r="D1" t="s" s="4"><v>3</v></c>
  </row>
  <!-- Assumptions (rows 2-3) -->
  <row r="2">
    <c r="A2" t="s" s="1"><v>4</v></c>    <!-- "Revenue Growth", blue -->
    <c r="B2" s="7"><v>0</v></c>          <!-- FY2023A: n/a, 0% placeholder -->
    <c r="C2" s="7"><v>0.12</v></c>       <!-- FY2024E: 12.0% input -->
    <c r="D2" s="7"><v>0.15</v></c>       <!-- FY2025E: 15.0% input -->
  </row>
  <row r="3">
    <c r="A3" t="s" s="1"><v>5</v></c>    <!-- "Gross Margin", blue -->
    <c r="B3" s="7"><v>0.45</v></c>
    <c r="C3" s="7"><v>0.46</v></c>
    <c r="D3" s="7"><v>0.47</v></c>
  </row>
  <!-- Model (rows 14-15) -->
  <row r="14">
    <c r="A14" t="s" s="2"><v>6</v></c>      <!-- "Revenue", black -->
    <c r="B14" s="5"><v>85000000</v></c>     <!-- actual, currency input -->
    <c r="C14" s="6"><f>B14*(1+C2)</f><v></v></c>
    <c r="D14" s="6"><f>C14*(1+D2)</f><v></v></c>
  </row>
  <row r="15">
    <c r="A15" t="s" s="2"><v>7</v></c>      <!-- "Gross Profit", black -->
    <c r="B15" s="6"><f>B14*B3</f><v></v></c>
    <c r="C15" s="6"><f>C14*C3</f><v></v></c>
    <c r="D15" s="6"><f>D14*D3</f><v></v></c>
  </row>
</sheetData>

Scenario B — Data + Summary (Two Sheets)

The Summary sheet pulls from Data using cross-sheet formulas (green, s="3"):

<!-- Summary/sheet2.xml sheetData excerpt -->
<sheetData>
  <row r="1">
    <c r="A1" t="s" s="4"><v>0</v></c>   <!-- "Metric" -->
    <c r="B1" t="s" s="4"><v>1</v></c>   <!-- "Value" -->
  </row>
  <row r="2">
    <c r="A2" t="s" s="0"><v>2</v></c>   <!-- "Total Revenue" -->
    <c r="B2" s="3"><f>SUM(Data!C2:C10000)</f><v></v></c>
  </row>
  <row r="3">
    <c r="A3" t="s" s="0"><v>3</v></c>   <!-- "Deal Count" -->
    <c r="B3" s="3"><f>COUNTA(Data!A2:A10000)</f><v></v></c>
  </row>
  <row r="4">
    <c r="A4" t="s" s="0"><v>4</v></c>   <!-- "Avg Deal Size" -->
    <c r="B4" s="3"><f>IF(B3=0,0,B2/B3)</f><v></v></c>
  </row>
</sheetData>

Scenario C — Multi-Department Consolidation

Consolidated sheet sums the same cells from multiple department sheets:

<!-- Consolidated/sheet4.xml — summing across Dept_Eng and Dept_Mkt -->
<sheetData>
  <row r="5">
    <c r="A5" t="s" s="2"><v>0</v></c>
    <!-- No spaces in sheet names → no quotes needed -->
    <c r="B5" s="3"><f>Dept_Engineering!B5+Dept_Marketing!B5</f><v></v></c>
  </row>
  <row r="6">
    <c r="A6" t="s" s="2"><v>1</v></c>
    <c r="B6" s="3"><f>SUM(Dept_Engineering!B6,Dept_Marketing!B6)</f><v></v></c>
  </row>
</sheetData>

What You Must NOT Do

  • Do NOT use openpyxl or any Python library to write the final xlsx file
  • Do NOT hardcode any calculated value — use <f> formulas for every derived number
  • Do NOT deliver without running formula_check.py first
  • Do NOT set a cell's s attribute to a value >= cellXfs count
  • Do NOT modify an existing <xf> entry in styles.xml — only append new ones
  • Do NOT add a new sheet without updating all four sync points (workbook.xml, workbook.xml.rels, [Content_Types].xml, actual .xml file)
  • Do NOT assign new worksheet rIds that overlap with rId1, rId2, or rId3 (reserved for sheet1, styles, sharedStrings in the template)
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