Description
Compare a CoNLL-U root label with zero head.
Language-processing records depend on tokenization, indexing, null sentinels and text representation. A UTF-8 byte offset, UTF-16 index, dependency link or literal feature label can be handled precisely without inferring linguistic correctness or semantic equivalence.
Compare a CoNLL-U root label with zero head.
When to use this tool
Use CoNLL-U Root Label Head Zero Check when checking a supplied linguistic annotation, span, alignment or text-offset convention.
How to use the tool and how it works
- Enter head, relation. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read rootLabel, zeroHead, agrees. Inspect rootLabel, zeroHead, agrees before interpreting the associated values.
Compare a CoNLL-U root label with zero head. Require nonnegative whole head; rootLabel means relation === root, zeroHead means head === 0, agrees tests their equivalence.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| head | Head | Required. Safe integer; minimum 0. |
| relation | Relation | Required. Text; maximum UTF-16 length 8192. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| rootLabel | Root Label | Required. Boolean. |
| zeroHead | Zero Head | Required. Boolean. |
| agrees | Agrees | Required. Boolean. |
{
"input": {
"head": 0,
"relation": "root"
},
"output": {
"rootLabel": true,
"zeroHead": true,
"agrees": true
}
}Limitations and assumptions
- This checks one consistency condition, not a complete CoNLL-U row, tree or linguistic relation annotation.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use the appropriate tokenizer, Unicode and annotation-format conventions and validate the complete text or tree for full linguistic processing.
References
Similar or alternative tools
- IPA Secondary Stress Position
Locate literal IPA secondary-stress markers.
- Morph Feature Empty Value Token
Distinguish empty morphology values from an explicit missing marker.