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-..
-   Copyright 2020-2022 David Robillard <d@drobilla.net>
-   SPDX-License-Identifier: ISC
-
-.. default-domain:: c
-.. highlight:: c
-
-#####
-World
-#####
-
-The world is the top-level object which represents an instance of Lilv.
-It is used to discover and load LV2 data,
-and stores an internal cache of loaded data for fast searching.
-
-An application typically has a single world,
-which is constructed once on startup and used throughout the application's lifetime.
-
-************
-Construction
-************
-
-A world must be created before anything else.
-A world is created with :func:`lilv_world_new`, for example:
-
-.. code-block:: c
-
-   LilvWorld* world = lilv_world_new();
-
-***************
-Setting Options
-***************
-
-Various options to control Lilv's behavior can be set with :func:`lilv_world_set_option`.
-The currently supported options are :c:macro:`LILV_OPTION_FILTER_LANG`,
-:c:macro:`LILV_OPTION_DYN_MANIFEST`, and :c:macro:`LILV_OPTION_LV2_PATH`.
-
-For example, to set the LV2 path to only load plugins bundled in the application:
-
-.. code-block:: c
-
-   LilvNode* lv2_path = lilv_new_file_uri(world, NULL, "/myapp/lv2");
-
-   lilv_world_set_option(world, LILV_OPTION_LV2_PATH, lv2_path);
-
-************
-Loading Data
-************
-
-Before using anything, data must be loaded from disk.
-All LV2 data (plugins, UIs, specifications, presets, and so on) is installed in `bundles`,
-a standard directory format
-
-Discovering and Loading Bundles
-===============================
-
-Typical hosts will simply load all bundles in the standard LV2 locations on the system:
-
-.. code-block:: c
-
-   lilv_world_load_all(world);
-
-This will discover all bundles on the system,
-as well as load the required data defined in any discovered specifications.
-
-It is also possible to load a specific bundle:
-
-.. code-block:: c
-
-   LilvNode* bundle_uri = lilv_new_file_uri(world, NULL, "/some/plugin.lv2");
-
-   lilv_world_load_bundle(world, bundle_uri);
-
-The LV2 specification itself is also installed in bundles,
-so if you are not using :func:`lilv_world_load_all`,
-it is necessary to manually load the discovered specification data:
-
-.. code-block:: c
-
-   lilv_world_load_specifications(world);
-   lilv_world_load_plugin_classes(world);
-
-*************
-Querying Data
-*************
-
-The world contains a model of all the loaded data in memory which can be queried.
-
-Data Model
-==========
-
-LV2 data is a set of "statements",
-where a statement is a bit like a simple machine-readable sentence.
-The "subject" and "object" are as in natural language,
-and the "predicate" is like the verb, but more general.
-
-For example, we could make a statement about a plugin in english:
-
-   MyOsc has the name "Super Oscillator"
-
-We can break this statement into 3 pieces like so:
-
-.. list-table::
-   :header-rows: 1
-
-   * - Subject
-     - Predicate
-     - Object
-   * - MyOsc
-     - has the name
-     - "My Super Oscillator"
-
-Statements use URIs to identify things.
-In this case, we assume that this plugin has the URI ``http://example.org/Osc``.
-The LV2 specification defines that ``http://usefulinc.com/ns/doap#name`` is the property used to describe a plugin's name.
-So, this statement is:
-
-.. list-table::
-   :header-rows: 1
-
-   * - Subject
-     - Predicate
-     - Object
-   * - ``http://example.org/Osc``
-     - ``http://usefulinc.com/ns/doap#name``
-     - "My Oscillator"
-
-Finding Values
-==============
-
-Based on this model, you can find all values that match a certain pattern.
-Patterns are just statements,
-but with ``NULL`` used as a wildcard that matches anything.
-So, for example, you can get the name of a plugin using :func:`lilv_world_find_nodes`:
-
-.. code-block:: c
-
-   LilvNode* plugin_uri = lilv_new_uri(world, "http://example.org/Osc");
-   LilvNode* doap_name  = lilv_new_uri(world, "http://usefulinc.com/ns/doap#name");
-
-   LilvNodes* values = lilv_world_find_nodes(world, plugin_uri, doap_name, NULL);
-
-Note that a set of values is returned,
-because some properties may have several values.
-When you are only interested in one value,
-you can use the simpler :func:`lilv_world_get` instead:
-
-.. code-block:: c
-
-   LilvNode* value = lilv_world_get(world, plugin_uri, doap_name, NULL);
-
-If you are only interested if a value exists at all,
-use :func:`lilv_world_ask`:
-
-.. code-block:: c
-
-   bool has_name = lilv_world_ask(world, plugin_uri, doap_name, NULL);