Document configuration

This is a family of operators that help create or recover information about the current document's structure:

• attribute(attributeNameStr).keys
• attribute(attributeNameStr)[keyStr]
• create([containerStr, ]nameStr)
• createAdornment([containerStr, ] nameStr)
• createAgent([containerStr, ]nameStr)
• createAttribute(nameStr[, dataType])
• document.keys
• document[[keyStr]]
• type(attributeNameStr)