How XeOF2 or XeF2 is formed?

These are many compounds which are exceptions to the octet rule. But they are stable and do exist. This is one of the main limitation of the octet rule.

through covalent bond....Xe can form maxm of 8 covalent bonds..

 XeF_{4      +    H2O   -------------------------->}   XeOF2

Xe + F2 -----------------> XeF2

approve!

Synthesis proceeds by the simple reaction: Xe + F2 → XeF2

XeOF₂ is formed by the reaction of OF₂ with xenon gas at low temperatures. It may also be obtained by the partial hydrolysis of XeF₄