In trading on Monday, shares of the SPDR S&P China ETF ( GXC) entered into oversold territory, changing hands as low as $76.40 per share. We define oversold territory using the Relative Strength Index, or RSI, which is a technical analysis indicator used to measure momentum on a scale of zero to 100. A stock is considered to be oversold if the RSI reading falls below 30.In the case of SPDR S&P China, the RSI reading has hit 29.3 — by comparison, the RSI reading for the S&P 500 is currently 47.2. A bullish investor could look at GXC's 29.3 reading as a sign that the recent heavy selling is in the process of exhausting itself, and begin to look for entry point opportunities on the buy side. Looking at a chart of one year performance (below), GXC's low point in its 52 week range is $68.90 per share, with $84.38 as the 52 week high point — that compares with a last trade of $76.53. SPDR S&P China shares are currently trading off about 2.4% on the day.