layoutType property
The type of the layout element that is being referenced if any.
Optional. Possible string values are:
- "LAYOUT_TYPE_UNSPECIFIED" : Layout Unspecified.
 - "BLOCK" : References a Page.blocks element.
 - "PARAGRAPH" : References a Page.paragraphs element.
 - "LINE" : References a Page.lines element.
 - "TOKEN" : References a Page.tokens element.
 - "VISUAL_ELEMENT" : References a Page.visual_elements element.
 - "TABLE" : Refrrences a Page.tables element.
 - "FORM_FIELD" : References a Page.form_fields element.
 
Implementation
core.String? layoutType;