test(xlsx): validate the package itself — content types, rels, core props

[productdevbook]

The last unchecked parts, and the ones whose failure is worst: a malformed .rels breaks the whole workbook, not one sheet.

All valid, across every relationship file in every document. 133 parts across eleven documents now.

part	schema
[Content_Types].xml	opc-contentTypes.xsd
every *.rels	opc-relationships.xsd
docProps/core.xml	opc-coreProperties.xsd

The setup cost, recorded so nobody repeats it

These schemas are in ECMA-376 Part 2 — a third download — and opc-coreProperties.xsd needs an edit before it will load at all.

It imports the Dublin Core schemas over plain HTTP; dublincore.org answers with a 302 that Java does not follow, so the parser reads the string 302 Found as schema content and gives up:

s4s-elt-character: Non-whitespace characters are not allowed in schema
elements other than xs:appinfo and xs:documentation. Saw "302 Found".

The header carries the four commands that fetch them and rewrite the imports as relative paths.

--opc is optional; without it the script behaves exactly as before.

Teeth

Checked on this path specifically, since it is a new schema: renaming <Default> to <Bogus> in the content-types writer turns [Content_Types].xml red, with the schema naming exactly what it expected instead.

Only VML is left unchecked, and the reason stays recorded beside the mapping — vml-main.xsd does not load in javax.xml.validation at all.

pnpm test green — 10,571 tests, 232 files.

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