Adds RDF term equality definitions

[hartig]

Closes #154 by adding definitions of 'blank node equality', 'triple term equality', 'RDF term equality', and 'triple equality'. Additionally, this PR makes the definitions of graph comparison and dataset comparison more explicit by using these notions of equality.

[hartig]

Note that I have removed this one because the cross-references to these definitions are integrated directly into the definition above now.

[pchampin]

The only change that I really "request" is the one in 'Graph Comparison', because (unless I'm missing something) it introduces an error.

The others are merely an expression of my preferences, but I can live without them.

[pchampin]

I could live with that, but I find it needlessly verbose and confusing. The point here is not to produce a new value that happens to be equal to the argument, the point is to return the argument itself...
I would slightly prefer to keep '=' here.

[pchampin]

Suggested change

	<li>|t| and <var>t'</var> are [=IRIs=] that are [=IRI equality|equal=].</li>
	<li>|t| and <var>t'</var> are [=literals=] that are [=literal term equality|equal=].</li>
	<li>|t| and <var>t'</var> are [=blank nodes=] that are [=blank node equality|equal=].</li>
	<li>|t| and <var>t'</var> are [=triple terms=] that are [=triple term equality|equal=].</li>
	<li>|t| and <var>t'</var> are [=IRIs=] that are [=IRI equality|equal=] (per [=IRI equality=]).</li>
	<li>|t| and <var>t'</var> are [=literals=] that are [=literal term equality|equal=] (per [=literal term equality=]).</li>
	<li>|t| and <var>t'</var> are [=blank nodes=] that are [=blank node equality|equal=] (per [=blank node equality=]).</li>
	<li>|t| and <var>t'</var> are [=triple terms=] that are [=triple equality|equal=] (per [=triple equality=]).</li>

I would not fight for this change, but I think it makes the rendered text more readable. It can easily be overlooked that the four occurrences of "equal" do not refer to the same definition.

Also, I think it is better to refer directly to "triple equality" than to "triple term equality". See my remark below.

[afs]

Or the pattern:

  <li>|t| and <var>t'</var> are [=IRIs=] that are [=IRI equality|equal as IRIs=].</li>

[pchampin]

Suggested change

	<p><dfn>Triple term equality</dfn>:
	Since triple terms are [=triples=], equality of triple terms is the same as [=triple equality=].</p>
	<p>Triple term equality:
	Since triple terms are [=triples=], equality of triple terms is the same as [=triple equality=].</p>

For the sake of regularity, I understand that it is desirable to have a paragraph about "Triple term equality". But I think that making it a definition is not required and adds confusion. As this paragraph explains, triples terms are triples, so triple equality applies here.

[afs]

There isn't a preview/diff? Is this because the boilerplate was not included in the description?

[afs]

One suggestion, non-blocking.

[hartig]

There isn't a preview/diff? Is this because the boilerplate was not included in the description?

Strange. I have never put anything special in my PRs before. What would this boilerplate be?

[afs]

There isn't a preview/diff? Is this because the boilerplate was not included in the description?

Strange. I have never put anything special in my PRs before. What would this boilerplate be?

It should be added when the PR is created via the github UI.

I don't know if it can be retrospectively added.
For this PR, it isn't to hard to get the PR branch and look at that. But if text is altered in several places, or text moved around, I find it useful to see the diff.

#159 for example has ("edit" the description to see it):

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