XML reference for .reahlproject

Project basics and dependencies

<project type=”egg”>

The project element is the top-level element in a .reahlproject file. It requires one attribute: type, which should be the string “egg”. An “egg” project is packaged as a Python egg.


A list of other eggs on which this project is dependent. It requires one attribute: purpose, which should the string “run” or “test” to indicate whether the listed dependencies are runtime dependencies, or that they are only needed for testing. (Runtime dependencies are available when testing too.)

Each dependency is listed as a child of a <deps> element, using the <egg> or <thirdpartyegg> elements.


Used to list a single dependency within a <deps> element. It requires one attribute: name, which should be set to the name of the egg referred to. Two more attributes are optional: version can be specified (as a string) to pin down the version of the dependency manually to what is specified here; ignoreversion (a boolean value) can be specified as False to indicate that the dependency can be on any version of the specified egg.

Use this element only for other projects in your workspace, under your control. Version information for such dependencies can be obtained from the metainfo in your workspace.

Changed in 3.0: The optional name and version attributes were added.


Used to list a single dependency within a <deps> element. It requires one attribute: name, which should be set to the name of the egg referred to.

Use this element to refer to any project, even if you are not the developer. Version information for such dependencies have to be specified explicitly. This is done using the maxversion and minversion attributes to this element.

Component functionality

locator attribute

Several elements make use of an attribute named locator. The value of this attribute is a string used to locate a Python object (a class, function, classmethod etc) which was defined in module scope. The string has the form ‘package.module:name’ where the part before the colon is a dot-separated package path to the module concerned. The part after the colon is the name of the object to import. It can be a simple name, but for class attributes it can also be dot-separated (ie, ‘MyClass.method_name’).


Used to indicate the Configuration class to be used for this component. It requires a locator attribute.


Used to list all the classes in this component that are persisted, using an ORM and hence need special handling. Each class is listed in-order using a <class> element.


Used to list one class in this component as part of either the <persisted> list of classes, or the <migrations> list. It requires a locator attribute.


Used to indicate the Python package in this component used to ship language catalogues for internationalisation purposes. It requires a locator attribute. Note that since it indicates a package only, the locator should not include a colon at all.


Used to list all the Migration classes in this component. Each class is listed in-order using a <class> element.


Used to indicate a function or class method to be called every time reahl runjobs is run. It requires a locator attribute for the relevant function or class method.


Used to list a number of Python packages that are namespace packages : A namespace package is a Python package of which some modules are contained in separate eggs. Each package is listed using the <package> element.


Lists a single Python package by name as being a namespace package (see <namespace>). It requires one attribute, name which is the name of the Python package.


Exports the class given by the locator attribute using the name attribute as a name. The export is done under the entry point named in entrypoint.


Exports the class method or function named by the locator attribute as a script with the name given by the name attribute.

Development and packaging


This section is used to provide metadata about the project. Each piece of metadata needed by a project is specified using an <info> element. A metadata element requires one attribute, the type which should be set to the string “reahlproject”. This indicates that the metadata is hardcoded in the .reahlproject file. (The implementation is designed to be extensible to use metadata from other sources as well.

The following <info> elements are required: version, description, long_description, maintainer_name, maintainer_email.


Use an <info>’ element inside a <metadata> element to supply one piece of metadata for a project. The `<info> element requires a name attribute which indicates which bit of information it supplies. The text contents of the <info> element contains the actual information.


If the <sourcecontrol> of a project is specified, it is used to infer the status of a project in development. For example, if you run reahl list -s a status is shown for each project listed. See reahl explainlegend for more information.

Currently two types of source control system are supported: Bazaar and Git. Use an attribute type set to the string “git” or “bzr” to indicate which source control system the project uses.


Use <distpackage> to indicate a package that should be built for distributing your project. The following package type are supported:

  • sdist: a Python egg source tarball.
  • wheel: a Python wheel (universal).

Set the type attribute of distpackage tag to one of the types above.

To build your distribution packages as per the .reahlproject file, run reahl build. Such packages are not yet uploaded.


Can be specified as child of a <distpackage> to indicate that the package should be uploaded to this repository. A <packageindex> represents a PyPi repository. It requires an attribute named repository which should be set to the URL of the repository (for example: https://pypi.org/project/reahl-workspace/).

A particular <distpackage> may be uploaded to several different repositories, each named in a <packageindex> element.