Layer 0: Syntax
    INTERSCRIPT/INTERCHANGE/1.0
        { -- body of the script -- }
    ENDSCRIPT
    INTERSCRIPT/INTERCHANGE/1.0
    {Text$ "Now is the ... party." "A second string"
      font_{Font$ name_Helvetica}}
    ENDSCRIPT
    INTERSCRIPT/INTERCHANGE/1.0
    {Paragraph$ lineJustification_T leftMargin_1.0*inch
        {Text$ "Now is the ... party." "A second string"
         font_{Font$ name_Helvetica}}
    } ENDSCRIPT
    INTERSCRIPT/INTERCHANGE/1.0
    {BarChart$
      xEdge_{edge | range_{1970 1980} delta_1 lbl_"Year"}}
      yEdge_{edge | range_{0 11.5} delta_0.5
                        lbl_"Corn(tons)"}
    {1970 7.7} {1980 11.2} {1973 7.8}
    } ENDSCRIPT

Layer 1: Semantics
    value space: atoms, numbers, strings, nodes, quoted expressions
    bindings and content
    structure: bindings, evaluation
    scope for names
    external environment
    The Interscript semantic function maps a script into a tree-like representation
        two scripts are equivalent if their semantic representations are equal

Safe Editing
    A tag on a node is like a type in Mesa
    A tag definition specifies
        relevant attributes
        other required tags
        allowed parent tags
        type of the contents
        a node invariant
        what more basic tag it can be reduced to (if any)
    Tag definitions enable an editor to deal safely with nodes with tags that it doesn't directly implement (deletion, copying, moving)

Standard Document Constructs
    Document$
    Measure$: {under, nominal, over}
    Span$: measures to define end points, distances from sibling spans, distances from enclosing span
    Box$: two spans
    Page$
    Text$, Font$, PseudoChar$
    Paragraph$
    TextField$
    TextRemoteContent$
    Together$
    Table$: TableHeading$, TableRow$, TableEntry$
    Inked$
    InterPress$
    Caution$


Layout
    Everything is defined in terms of boxes
    Solid layout
    Layout with templates: Pouring streams, labels
    Pours and penalties: fences
    Multi-level pours


Contents of the Draft Standard

    1. Introduction
    2. The Language Basis: Syntax, Semantics, and Encoding
    3. Tag Declaration, Node Invariants, and Safety Rules for Editors
    4. Standard Document Constructs
    5. Layout
    6. Other Constructs
    7. Pragmatics
    Appendix A:  Glossary
    Appendix B:  Example of Script Evaluation
    Index