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hermes-skills/skills/legal/contract-editor/references/merge-layered-revisions-with-priority.md
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# Merge Layered Revisions with Priority (Accept Inner Author's Edits)
## Scenario (2026-07-03 模特合作协议案)
File has two layers of tracked changes:
- **Layer 1 (WB)**: Original review modifications
- **Layer 2 (华诚-Z)**: User edited on top of WB's tracked changes
Result: 华诚-Z's `w:del` elements are **nested inside** WB's `w:ins` elements — meaning 华诚-Z deleted portions of what WB had inserted.
User instruction: "以华诚-Z为准" (prioritize 华诚-Z), then unify all author names to WB.
## Three-Step Algorithm
### Step 1: Accept nested deletions (inner author wins)
Find all `w:del[author=华诚-Z]` nested inside `w:ins[author=WB]` and remove them (= accept the deletion):
```python
def accept_nested_deletions(body, inner_author='华诚-Z', outer_author='WB'):
for ins_elem in body.findall(f'.//{W}ins'):
if ins_elem.get(f'{W}author') != outer_author:
continue
for del_elem in ins_elem.findall(f'.//{W}del'):
if del_elem.get(f'{W}author') == inner_author:
parent = del_elem.getparent()
parent.remove(del_elem)
```
### Step 2: Remove empty outer elements
After accepting nested deletions, some WB ins elements may be empty (all their content was deleted by 华诚-Z):
```python
def remove_empty_ins(body):
for ins_elem in body.findall(f'.//{W}ins'):
has_text = False
for t in ins_elem.findall(f'.//{W}t'):
if t.text and t.text.strip():
has_text = True
break
if not has_text:
parent = ins_elem.getparent()
if parent is not None:
parent.remove(ins_elem)
```
### Step 3: Unify author names
```python
def rename_author(body, old_author, new_author):
count = 0
for elem in body.iter():
author = elem.get(f'{W}author')
if author == old_author:
elem.set(f'{W}author', new_author)
count += 1
return count
```
## Complete Flow
```python
from docx import Document
from lxml import etree
doc = Document('input.docx')
body = doc.element.body
# Step 1: Accept 华诚-Z deletions of WB content
accept_nested_deletions(body, inner_author='华诚-Z', outer_author='WB')
# Step 2: Clean up empty WB ins elements
remove_empty_ins(body)
# Step 3: Rename 华诚-Z → WB
rename_author(body, '华诚-Z', 'WB')
doc.save('output.docx')
```
## After Merge: Additional Modifications
After merging, you can continue adding new WB tracked changes on the unified file (e.g., reverting specific clauses to template wording). Use standard tracked change creation:
```python
def make_del(text, rPr=None, author='WB', date='2026-07-03T06:00:00Z'):
d = etree.Element(f'{W}del')
d.set(f'{W}id', str(abs(hash(text)) % 100000))
d.set(f'{W}author', author)
d.set(f'{W}date', date)
r = etree.SubElement(d, f'{W}r')
if rPr is not None:
r.append(deepcopy(rPr))
dt = etree.SubElement(r, f'{W}delText')
dt.set('{http://www.w3.org/XML/1998/namespace}space', 'preserve')
dt.text = text
return d
def make_ins(text, rPr=None, author='WB', date='2026-07-03T06:00:00Z'):
ins = etree.Element(f'{W}ins')
ins.set(f'{W}id', str(abs(hash(text + 'ins')) % 100000))
ins.set(f'{W}author', author)
ins.set(f'{W}date', date)
r = etree.SubElement(ins, f'{W}r')
if rPr is not None:
r.append(deepcopy(rPr))
t = etree.SubElement(r, f'{W}t')
t.set('{http://www.w3.org/XML/1998/namespace}space', 'preserve')
t.text = text
return ins
```
## Verification
After merge:
- `set(elem.get(W+'author') for elem in body.iter() if elem.get(W+'author'))` should return `{'WB'}` only
- Count ins/del elements to confirm reasonable numbers
- Verify key clauses read correctly in "accepted" view
## Key Distinction from `unify-author-wb.py`
The `scripts/unify-author-wb.py` script **only renames authors** — it does NOT handle nested deletions. If 华诚-Z has `w:del` inside WB's `w:ins`, just running unify will rename the del to WB but **leave the deleted content still marked as deleted inside the insertion** — creating a confusing state where WB appears to both insert and delete the same text.
**Always run the three-step algorithm** when inner author has modified outer author's tracked changes.