New Features

• Zef repo has been open-sourced under the Apache License 2.0.

• New traversal syntax...

  • Instead of z >> RT.Something use z | Out[RT.Something]
  • Instead of z >> L[RT.Something] use z | Outs[RT.Something]
  • Instead of z < RT.Something use z | in_rel[RT.Something]

• The traversal operators now can take another argument to filter on the target/source, e.g. z | Outs[RT.Something][ET.SpecificEntity].

• PyPI packages. Zef can now be installed via pip install zef.

• General movement from predicates to types:

  • is_a compares its argument to a type.
  • Use Is[<predicate>] to create a type which is the set of all items where the predicate is satisfied.

• pattern matching with the match operator. match_apply has been retired, if a constant value is to be returned this is easily done with a lambda.

• the Pattern function: returns a ValueType and allows very concise pattern matching on dictionaries and lists.

• Preliminary Windows support.

New ZefOps

• schema to show delegate entities/relations. Note: the output of this is not stable and likely to change.

• events on a ZefRef replaces instantiation_tx, termination_tx, etc...

• events on a TX replaces instantiated, terminated, etc...

• absorbed and without_absorbed manipulate parameters absorbed into ZefOps.

Bug Fixes

• Many fixes!

Deprecations

• New traversal syntax with ZefOps.

  • The operators >>, <<, >, < are deprecated along with the L[...] and O[...] syntax.
  • Instead use the operators like the following examples for single values:
    • z | Out[...] returns a ZefRef to the target of the outgoing relation
    • z | In[...]
    • z | out_rel[...] the ZefRef to the relation itself is returned
    • z | in_rel[...]
  • Multiple relations are obtained with a plural form of these operators:
    • z | Outs[...] for multary relations (a list of ZefRef is returned)
    • z | Ins[...]
    • z | out_rels[...]
    • z | in_rels[...]

• match_apply is retired for match.