Constructing flow object sequences

• Constructor can hide content by returning empty flow object sequence
• A constructor can construct a flow object by specifying its type and characteristics
• The characteristics applicable to a flow object are either inherited or non-inherited
• A non-inherited characteristic can be specified explicitly or in most cases can be defaulted
• An inherited characteristic gets its value from the current characteristic set; this is an implicit argument to the query-construct function
• For a non-atomic flow object, can also specify the content of the flow object
• Default for content is flow object sequence that contains in order results of applying the query-construct function to the children of the current node
• This is also default for elements with no applicable query-construct specification
• Constructor can apply query-construct function to result of any query