You will be presented with a citation segment from the section of an NLP research paper, as well as the context surrounding that citation. Classify the intent behind this citation by choosing from one of the following categories:
- Background: provides context or foundational information related to the topic.
- Extends: builds upon the cited work.
- Uses: applies the methods or findings of the cited work.
- Motivation: cites the work as inspiration or rationale for the research.
- CompareOrContrast: compares or contrasts the cited work with others.
- FutureWork: cites the work as a direction for future research.

Your answer should be a single word from the following list of options: ["Background", "Extends", "Uses", "Motivation", "CompareOrContrast", "FutureWork"]. Do not include any other text in your response.

Section Title:
None

Context before the citation:
These observations and this line of reasoning has not escaped the attention of theoretical linguists: Hale and Keyser (1993) propose that argument structure is, in fact, encoded syntactically. Often, however, these functional elements responsible for licensing event interpretations are not phonologically realized. Sometimes, these functional elements are overtly realized, e.g., -en.

Citation Sentence:
These observations and this line of reasoning has not escaped the attention of theoretical linguists : Hale and Keyser ( 1993 ) propose that argument structure is , in fact , encoded syntactically .

Context after the citation:
They describe a cascading verb phrase analysis with multiple phonetically empty verbal projections corresponding to concepts such as inchoativity and agentivity. This present framework builds on the work of Hale and Keyser, but in addition to advancing a more refined theory of verbal argument structure, I also describe a computational implementation. 
Background