[Xcb] schema for xcb validation

[Josh Triplett]

Thomas Hunger wrote:
> the attachment contains a simple validator scheme written in relax ng 
> compact syntax [1] for the xcb xml description language. It can be 
> convertet to something xmllint understands by e.g. trang [2]:

Thanks for working on this!

> +grammar {
> +   start = XCB
> +
> +   XCB = element xcb {
> +      attribute header {text},
> +      attribute extension-xname {text}?,
> +      attribute extension-name {text}?,

Any way to add a constraint that says these go together, such that you must
have both or neither?

> +   IMPORT = element import {text}

We might want to constrain "text" in some way here, such as to an identifier.

> +   STRUCT = element struct {
> +      attribute name {text},

Ditto for this and other name attributes.

> +   REQUEST = element request {
> +      attribute name {text},
> +      attribute opcode {xs:integer},
> +      attribute combine-adjacent {xs:boolean}?,
> +      (LIST | FIELD | PAD | EXPRFIELD)*,
> +      REPLY?,
> +      VALUEPARAM?

This doesn't look right; valueparam doesn't come after reply, it goes in the
set of alternatives.

> +   FIELDREF = element fieldref { text }

Same constraint as for field names and types.

> +   VALUE = element value { text }
> +   BIT = element bit { text }

Shouldn't both of these use xs:integer?

> +   OP = element op { attribute op {text}, EXPR, EXPR}

Can you give the explicit list of acceptable operators here, rather than just
"text"?

- Josh Triplett

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