#27 refer to instances with 'the'

[Anonymous]

The current parser requires instances to be referred to without an article. A concept can be preceded by articles 'a', 'an', or 'the' (e.g. a River, an Ontology, the Sea), but this is not supported for instances. The article 'the' should be accepted, as some sentences read better with it. For example:

OS Hydrology Ontology aims to describe the OS Hydrology Feature Classes.
would read much better if it started with 'the'.

But the article is also useful in a sentence such as:

Every OS Hydrology Feature Class is surveyed by 'the' Ordnance Survey.

[Ronald Denaux]

The best way to include this seems to be to add a <instance object> element to the BNF, where

<instance object> := ['the'] <instance>

And then we need to replace <instance> for <instane object> where necessary.