Add Dynamic namespace serialization mode that collects xmlns declarations at runtime

[Copilot]

Related to #256

[Copilot]

Pull request overview

Adds a new NamespaceSerialization::Dynamic mode for quick_xml codegen that collects namespace declarations from the runtime value before emitting the root start tag, preventing unconditional xmlns:xsi pollution when nillable support is enabled.

Changes:

• Introduces NamespaceSerialization::Dynamic and wires it into Config to automatically add a new QuickXmlCollectNamespaces render step.
• Adds a CollectNamespaces trait (with primitive/container impls) and codegen for generated types to traverse values and emit only required xmlns declarations on the root element.
• Adds/updates integration tests and expected outputs to validate dynamic behavior (incl. xmlns:xsi only when a nil is present).

Reviewed changes

Copilot reviewed 25 out of 26 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
xsd-parser/tests/utils.rs	Updates quick-xml event comparison (currently includes debug output).
xsd-parser/tests/feature/nillable/mod.rs	Adds dynamic quick_xml generation + runtime serialization tests for nil vs non-nil.
xsd-parser/tests/feature/nillable/expected/dynamic_quick_xml.rs	New expected generated code using CollectNamespaces at root.
xsd-parser/tests/feature/nillable/example/dynamic_with_nil.xml	New expected output where root includes xmlns:xsi only when nil present.
xsd-parser/tests/feature/nillable/example/dynamic_no_nil.xml	New expected output where xmlns:xsi is omitted when no nil present.
xsd-parser/tests/feature/namespaces_qualified/mod.rs	Adds dynamic-mode test variants (alt / no-alt prefixes).
xsd-parser/tests/feature/namespaces_qualified/expected/quick_xml_dynamic_no_alt.rs	New expected output for dynamic mode without alternative prefixes.
xsd-parser/tests/feature/namespaces_qualified/expected/quick_xml_dynamic_alt.rs	New expected output for dynamic mode with alternative prefixes.
xsd-parser/tests/feature/namespaces_qualified/example/dynamic_no_alt.xml	New expected XML for dynamic mode without alternative prefixes.
xsd-parser/tests/feature/namespaces_qualified/example/dynamic_alt.xml	New expected XML for dynamic mode with alternative prefixes.
xsd-parser/src/pipeline/renderer/steps/quick_xml/serialize.rs	Adds Dynamic variant and emits CollectNamespaces::collect_namespaces(...) on root.
xsd-parser/src/pipeline/renderer/steps/quick_xml/mod.rs	Registers new collect_namespaces module and exports the render step.
xsd-parser/src/pipeline/renderer/steps/quick_xml/collect_namespaces.rs	New render step generating CollectNamespaces impls for generated types.
xsd-parser/src/pipeline/renderer/steps/mod.rs	Re-exports QuickXmlCollectNamespacesRenderStep.
xsd-parser/src/pipeline/renderer/mod.rs	Re-exports QuickXmlCollectNamespacesRenderStep from the renderer.
xsd-parser/src/pipeline/generator/data/reference.rs	Refactors nillable path handling (removes explicit absolute variable).
xsd-parser/src/pipeline/generator/data/mod.rs	Centralizes “absolute paths” decision inside path_data_* helpers.
xsd-parser/src/pipeline/generator/data/complex.rs	Updates call sites to refactored path_data_* helpers.
xsd-parser/src/models/data/path_data.rs	Fixes generic rendering to include commas between generic arguments.
xsd-parser/src/lib.rs	Exposes QuickXmlCollectNamespacesRenderStep from crate root exports.
xsd-parser/src/config/renderer.rs	Adds RenderStep::QuickXmlCollectNamespaces to config system.
xsd-parser/src/config/mod.rs	Auto-adds QuickXmlCollectNamespaces step when Dynamic is selected.
xsd-parser-types/src/xml/nillable.rs	Implements CollectNamespaces for Nillable<T> (adds XSI only when nil).
xsd-parser-types/src/quick_xml/serialize.rs	Introduces CollectNamespaces trait + impls for primitives/containers.
xsd-parser-types/src/quick_xml/mod.rs	Re-exports CollectNamespaces.
.gitignore	Ignores .devcontainer/.

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Pull request overview

Copilot reviewed 24 out of 25 changed files in this pull request and generated 1 comment.

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Pull request overview

Copilot reviewed 24 out of 25 changed files in this pull request and generated no new comments.

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