
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given the ellipse $\frac {x^{2}}{a^{2}}+ \frac {y^{2}}{b^{2}}=1(a>b>0)$ with eccentricity $e= \frac { \sqrt {3}}{2}$, and it passes through the point $( \sqrt {3}, \frac {1}{2})$  
(Ⅰ) Find the equation of the ellipse;  
(Ⅱ) Let line $l: y=kx+m(k\neq0，m>0)$ intersect the ellipse at points P and Q, and a rhombus with PQ as its diagonal has one vertex at $(-1，0)$. Find the maximum area of $\triangle OPQ$ and the equation of line $l$ at this condition.

Present the answer in LaTex format: \boxed{Your answer}
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