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allow and, or and with operators #876

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allow and, or and with operators #876

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16 changes: 14 additions & 2 deletions chapters/SPDX-license-expressions.md
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Expand Up @@ -22,12 +22,18 @@ simple-expression = license-id / license-id"+" / license-ref
compound-expression = (simple-expression /


simple-expression "WITH" license-exception-id /
simple-expression "WITH" license-exception-id /

simple-expression "with" license-exception-id /

compound-expression "AND" compound-expression /

compound-expression "and" compound-expression /

compound-expression "OR" compound-expression /

compound-expression "or" compound-expression /

"(" compound-expression ")" )

license-expression = (simple-expression / compound-expression)
Expand All @@ -47,7 +53,7 @@ In the `tag:value` format, a license expression MUST be on a single line, and MU

## D.2 Case sensitivity <a name="D.2"></a>

License expression operators (`AND`, `OR` and `WITH`) should be matched in a *case-sensitive* manner.
License expression operators (`AND`, `and`, `OR`, `or`, `WITH` and `with`) should be matched in a *case-sensitive* manner. I.e., variations `And`, `oR` are not allowed.

License identifiers (including license exception identifiers) used in SPDX documents or source code files should be matched in a *case-insensitive* manner. In other words, `MIT`, `Mit` and `mIt` should all be treated as the same identifier and referring to the same license.

Expand Down Expand Up @@ -103,6 +109,8 @@ An example representing a choice between three different licenses would be:
LGPL-2.1-only OR MIT OR BSD-3-Clause
```

It is allowed to use the operator in lower case form `or`.

### D.4.3 Conjunctive "AND" operator <a name="D.4.3"></a>

If required to simultaneously comply with two or more licenses, use the conjunctive binary "AND" operator to construct a new license expression, where both the left and right operands are a valid license expression values.
Expand All @@ -125,6 +133,8 @@ An example where all three different licenses apply would be:
LGPL-2.1-only AND MIT AND BSD-2-Clause
```

It is allowed to use the operator in lower case form `and`.

### D.4.4 Exception "WITH" operator <a name="D.4.4"></a>

Sometimes a set of license terms apply except under special circumstances. In this case, use the binary "WITH" operator to construct a new license expression to represent the special exception situation. A valid `<license-expression>` is where the left operand is a `<simple-expression>` value and the right operand is a `<license-exception-id>` that represents the special exception terms.
Expand All @@ -137,6 +147,8 @@ GPL-2.0-or-later WITH Bison-exception-2.2

The current set of valid exceptions can be found in Annex [A.2](SPDX-license-list.md#A.2). For the most up to date set of exceptions please see [spdx.org/licenses](https://spdx.org/licenses). If the applicable exception is not found on the SPDX License Exception List, then use a single `<license-ref>` to represent the entire license terms (including the exception).

It is allowed to use the operator in lower case form `with`.

### D.4.5 Order of precedence and parentheses <a name="D.4.5"></a>

The order of application of the operators in an expression matters (similar to mathematical operators). The default operator order of precedence of a `<license-expression>` a is:
Expand Down
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