A set of general entities (amp, lt, gt, apos, quot) is specified for this purpose. Numeric character references may also be used; they are expanded immediately when recognized and must be treated as character data, so the numeric character references " < " and " & " may be used to escape < and & when they occur in character data.] ...
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& ampersand & < less than sign < > greater than sign > " the double quote sign " Appendix II lists a broad range of characters and symbols, relating their ISO names to the corresponding character codes in common character sets. They allow authors to include accented characters in 7-bit ASCII documents. Some other useful entity ...
The problem with replacing the char is that there could be a mix of already-escaped ampersands alongside unescaped ampersands. & would become &. In addition to wrecking those, the primitive approach will also invalidate other legitimate escape sequences such as < and >-turning them into < and <.
一、概述 在 HTML 中，某些字符是预留的。在 HTML 中不能使用小于号（<）和大于号（>），这是因为浏览器会误认为它们是标签。如果希望正确地显示预留字符，我们必须在 HTML 源代码中使用字符实体（character entities）。字符实体类似如下： &entity_name; 或者 &#entity_number; 如需显示小于号 ...
All, I'm in the process of converting a .net project for 9.3 into a 10.1 ESRI AddIn. I've tinkered around with AddIns only a little. Whilst in visual studio editing the Config.esriaddinx file when I start to type out an element such as