text: {} Escape Sequence / Markup Extension
  Provides the XAML escape sequence for attribute values. The escape sequence allows the subsequent values in the attribute to be interpreted as a literal.
  The escape sequence ({}) is used so that an open brace ({)can be used as a literal character in XAML.
  XAML readers typically use the open brace ({) to denote the entry point of a markup extension; however, they first check the next character to determine whether it is a closing brace (}). Only when the two braces ({}) are adjacent, are they considered an escape sequence.
  If the escape sequence is encountered, the XAML reader should process the remainder of the string as a string. However, if the escape sequence is applied to a member that has a type converter, the string might undergo type conversion when it is interpreted by a XAML writer.
  The escape sequence is not a markup extension and is not backed by a class. However, it is a convention that XAML readers (including custom XAML readers) should respect.
  A quotation mark (") cannot be used as an escape sequence in this manner. If you need to set a quotation mark a XAML markup extension might appear. This includes the start of a XAML attribute value, and in a markup extension, immediately after an equal sign (=). The following example shows escape sequences for an XML namespace that appears at the start>