DocInitializationBuilder builder = new DocInitializationBuilder();
builder.elementStart("body", Attributes.EMPTY_MAP);
for (int i = 0; i < SIZE; i++) {
builder.elementStart("line", Attributes.EMPTY_MAP).elementEnd();
}
builder.elementEnd();
content1 = new ContentDocument(ConversationSchemas.BLIP_SCHEMA_CONSTRAINTS);
content1.setRegistries(Editor.ROOT_REGISTRIES);
content1.consume(builder.build());
doc1 = content1.getMutableDoc();