As well as avoiding causing memory burden on the user when using a publishing application, the intention is not to cause memory burden in terms of cost or manageability of the external services or restrictions. While some external services are only available during the content producing phase, some map services are partially available on a continuous basis if some public domain works contain interactive maps, and are not always unlimited free of charge. To some extent, this is also a business decision, i.e. what can be promised to the client of the publishing application, etc.
Using maps in your writing is a spectacular way to clarify location. An external API is used for reverse geocoding purposes to convert e.g. a given location like a city name into map coordinates. There are a few different choices as a map service to use.
Third-party software components are used to display maps, and initial tryouts in implementing them have given rise to a wide range of ideas on how to allow the user to make use of the maps. Possibilities include the use of stylistically different map tiles, elements to be added on top of the map and route guidance. Another consideration is that the use of map services may be subject to a fee up to a certain level of use and that the number of access times per some time period may be limited. The user must obtain a user acccount for the map service API by registering as a user and then locate the required API key, which is placed in the user-specific settings of the publishing application.
Other particulars under consideration include podcasts, for which there are a few dozen hosting services that offer a supplementary web-based audio player that can be embedded on a web page. Whether to make all of these available, or just some of them? Can such decisions be made more than once? Audio files can be used while waiting for a decision to be made. Transcribes of audio files are also an experimental feature, but perhaps mainly because they requires a bit of extra effort on the part of the user the first time.