schema validation with entities

Good morning - is there any way to successfully execute schema validation on XML containing entity definitions/references with libxml2 *without* substituting the entities yourself?  I notice xmllint produces the same error I'm getting in my code:

ent_exp3.xml:8: element fruit: Schemas validity error : Internal error: xmlSchemaVDocWalk, there is at least one entity reference in the node-tree currently being validated. Processing of entities with this XML Schema processor is not supported (yet). Please substitute entities before validation..
fruits_ent_exp3.xml validation generated an internal error


Thanks,
Lara

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