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/// Provides basic types and syntax for defining XML and HTML fragments
/// as a deep EDSL in F#.  Design goals:
///
///     A. Allow different concrente interpretations, including:
///         1. XML documents and fragments
///         2. HTML(5) documents and fragmetns
///         3. XML or HTML templates with placeholders and/or instructions
///
///     B. Provide minimal type safetiy ensuring some sanity but not encoding every
///        invariant, which seems not practical with the weak F# type system.