8. A system, comprising: a hardware processor; and a memory device, the memory device storing instructions, the instructions when executed causing the hardware processor to perform operations, the operations comprising: storing a hybrid markup language document; determining a partition boundary in the hybrid markup language document; generating a copy of the hybrid markup language document in response to the partition boundary; discarding content in the copy of the hybrid markup language document that precedes the partition boundary; and generating an output markup language document from remaining content occurring in the copy of the hybrid markup language document after the partition boundary.
8. A system, comprising: a hardware processor; and a memory device, the memory device storing instructions, the instructions when executed causing the hardware processor to perform operations, the operations comprising: storing a hybrid markup language document; determining a partition boundary in the hybrid markup language document; generating a copy of the hybrid markup language document in response to the partition boundary; discarding content in the copy of the hybrid markup language document that precedes the partition boundary; and generating an output markup language document from remaining content occurring in the copy of the hybrid markup language document after the partition boundary. 10. The system of claim 8 , wherein the operations further comprise generating a stack associated with the hybrid markup language document.