Update README in test-set sequenceUnbounded

Author: ekrich

tests/test-set/sequenceUnbounded/README.md

@@ -1,53 +1,24 @@
-# Sequence maxOccurs="unbounded" Test
+## Sequence maxOccurs="unbounded" Test
 
-This test documents a known EXIP limitation with `<sequence maxOccurs="unbounded">` patterns.
+Attempted reproducer for a grammar collision issue found in CCSDS NDM/XML 4.0 schemas.
 
-## Issue
+### Real-World Issue
 
-EXIP currently triggers an assertion at `src/grammarGen/src/genUtils.c:268` when processing schemas containing:
+CCSDS NDM/XML 4.0 schemas trigger a grammar collision error during schema generation:
 
-```xml
-<xsd:sequence maxOccurs="unbounded">
-   <xsd:element .../>
-   <xsd:element .../>
-</xsd:sequence>
+```
+> Grammar collision: duplicate adjacent elements in sequence not implemented yet at genUtils.c, line 269
 ```
 
-This pattern is valid W3C XML Schema but EXIP's collision detection is too strict.
-
-## Test Files
-
-- `test.xsd` - Minimal schema demonstrating the pattern
-- `test.xml` - Sample data exercising the schema
-- `check_sequence_unbounded.c` - Test code (in `tests/` directory)
-
-## Pattern
-
-The schema represents: `(item? value?)*`
-
-This allows:
-- Zero or more sequence iterations
-- Each iteration can have 0-1 item and 0-1 value
-- Items can appear after values across sequence boundaries
-
-## Expected Behavior
-
-**Current:** Assertion failure at genUtils.c:268
-
-**Once fixed:** Grammar generation should succeed (EXIP_OK)
-
-## Why This Matters
+The schemas return `EXIP_NOT_IMPLEMENTED_YET` (error code 1) and cannot be loaded.
 
-1. CCSDS NDM/XML 4.0 specification uses this pattern
-2. Pattern is memory-efficient (loop-back edges, no rule explosion)
-3. Infrastructure already exists (same as element-level maxOccurs="unbounded")
-4. Fix is likely relaxing overly-strict validation
+### Reproducer Status
 
-## Running the Test
+Incomplete - the minimal schema here does **not** trigger the collision. The `test_sequence_unbounded` test in `check_strict_grammar` currently passes (schema loads successfully with `EXIP_OK`).
 
-```bash
-cd build/vs2022/Debug  # or Release
-./check_sequence_unbounded.exe ../../tests/test-set
-```
+### Test Files
 
-Expected: Currently fails with assertion. Once fixed, should pass.
+- `test.xsd` - Minimal schema attempting to reproduce the pattern
+- `test.xsd.exi` - EXI-encoded schema
+- `test.xml` - Sample data
+- `test.xml.exi` - EXI-encoded data