1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):
[ ] N
[x] Y
re #2
#### 2. What is the scope of this PR (e.g. component or file name):
`grammar.js`
`schema.txt`
#### 3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):
[ ] Affects user behaviors
[x] Contains syntax changes
[ ] Contains variable changes
[ ] Contains experimental features
[ ] Performance regression: Consumes more CPU
[ ] Performance regression: Consumes more Memory
[ ] Other
[x] Resolved issues in the schema conifg
[x] Added test cases for it
4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):
[x] N
[ ] Y
5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:
[ ] Unit test
[ ] Integration test
[ ] Benchmark (add benchmark stats below)
[ ] Manual test (add detailed scripts or steps below)
1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):
4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):
5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links: