Australia's tech stocks gain as Wall Street climbs on Middle East optimism
** Australian tech stocks .AXIJ rise as much as 5.4%; log best day since April 8 ** Sub-index tracks U.S. peers, which rallied more than 1% as investors remained optimistic that Middle East war could see a resolution .N ** New Zealand-based Xero XRO.AX gains 4%; sector major WiseTech WTC.AX rises as much as 6.9% ** WTC among top gainers on broader ASX200 index .AXJO ** YTD, AXIJ down more than 25% (Reporting by Rajasik Mukherjee in Bengaluru) ((Rajasik.Mukherjee@thomsonreuters.com))