4.7 Extension

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4.7.1 Additive changes #

The following are additive, and a consumer or provider built to this version behaves correctly in their presence:

• A new identifier in §4.A. A theme that lacks it is a theme that does not provide it, which every consumer already handles.
• A new theme in the chain. A consumer built to this version looks in it like any other.
• A new source in §4.5, consulted after the type. A consumer built to this version draws generic where a newer one would draw the new source's icon.
• A new governing specification, consulted first under §4.5.

4.7.2 Changes requiring a new version #

• A new file format in a theme (§4.4). A consumer built to this version does not find the file, so the identifier is not provided, so every subject that relies on it is misdrawn as something further down the chain.
• A new meaningful form of identifier (§4.3), since the set is closed.
• A change to the order of §4.5, or a source inserted before the type. Two consumers on one system would then disagree about what a file looks like.
• A change to the form of an identifier.

4.7.3 Reserved #

The pgss.icon name, in the user extended-attribute namespace and as the suffix of a section name, is this chapter's. A specification that wants a file to carry something else MUST use another name.

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