12 library(semweb/rdf_portray): Portray RDF resources

To be done

- Define alternate predicate to use for providing a comment
- Use rdf:type if there is no meaningful label?
- Smarter guess whether or not the local identifier might be meaningful to the user without a comment. I.e. does it look‘word-like’?

This module defines rules for user:portray/1 to help tracing and debugging RDF resources by printing them in a more concise representation and optionally adding comment from the label field to help the user interpreting the URL. The main predicates are:

• rdf_portray_as/1 defines the overall style
• rdf_portray_lang/1 selects languages for extracting label comments

[det]rdf_portray_as(+Style)

Set the style used to portray resources. Style is one of:

prefix:id

Write as NS:ID, compatible with what can be handed to the rdf predicates. This is the default.

writeq

Use quoted write of the full resource.

prefix:label

Write namespace followed by the label. This format cannot be handed to rdf/3 and friends, but can be useful if resource-names are meaningless identifiers.

prefix:id=label

This combines prefix:id with prefix:label, providing both human readable output and output that can be pasted into the commandline.

[det]rdf_portray_lang(+Lang)

If Lang is a list, set the list or preferred languages. If it is a single atom, push this language as the most preferred language.