diff --git a/skema/rest/schema.py b/skema/rest/schema.py
index 571e279e367..5ab466b6655 100644
--- a/skema/rest/schema.py
+++ b/skema/rest/schema.py
@@ -81,7 +81,7 @@ class EquationsToAMRs(BaseModel):
         ]],
     )
     model: Literal["regnet", "petrinet", "met", "gamr", "decapode"] = Field(
-        description="The model type", examples=[["gamr"], ["regnet"], ["petrinet"], ["met"], ["decapode"]]
+        description="The model type", examples=["gamr"]
     )
 
 class MmlToAMR(BaseModel):
diff --git a/skema/rest/workflows.py b/skema/rest/workflows.py
index 4043b745f9a..8f4d97ad48a 100644
--- a/skema/rest/workflows.py
+++ b/skema/rest/workflows.py
@@ -9,6 +9,7 @@
 from typing import List
 from pathlib import Path
 import httpx
+import requests
 
 from fastapi import APIRouter, Depends, File, UploadFile, FastAPI, Request
 from starlette.responses import JSONResponse
@@ -79,7 +80,7 @@ async def equation_to_amrs(data: schema.EquationsToAMRs, client: httpx.AsyncClie
     """
     eqns = utils.parse_equations(data.equations)
     if data.model == "petrinet" or data.model == "regnet":
-        payload = {"mathml": data.equations, "model": data.model}
+        payload = {"mathml": eqns, "model": data.model}
         res = await client.put(f"{SKEMA_RS_ADDESS}/mathml/amr", json=payload)
         if res.status_code != 200:
             res_new = await client.put(f"{SKEMA_RS_ADDESS}/mathml/g-amr", json=eqns)
diff --git a/skema/skema-rs/mathml/src/parsers/generic_mathml.rs b/skema/skema-rs/mathml/src/parsers/generic_mathml.rs
index 79e25562d03..8fcc4602712 100644
--- a/skema/skema-rs/mathml/src/parsers/generic_mathml.rs
+++ b/skema/skema-rs/mathml/src/parsers/generic_mathml.rs
@@ -221,11 +221,30 @@ pub fn rparen(input: Span) -> IResult<Operator> {
     Ok((s, op))
 }
 
+pub fn comma(input: Span) -> IResult<Operator> {
+    let (s, op) = value(Operator::Comma, ws(tag(",")))(input)?;
+    Ok((s, op))
+}
+
+pub fn period(input: Span) -> IResult<Operator> {
+    let (s, op) = value(Operator::Period, ws(tag(".")))(input)?;
+    Ok((s, op))
+}
+
 pub fn mean(input: Span) -> IResult<Operator> {
     let (s, op) = value(Operator::Mean, ws(tag("¯")))(input)?;
     Ok((s, op))
 }
 
+pub fn hat(input: Span) -> IResult<Operator> {
+    let (s, op) = value(Operator::Hat, alt((ws(tag("^")), ws(tag("&#x5E;")))))(input)?;
+    Ok((s, op))
+}
+
+pub fn grad(input: Span) -> IResult<Operator> {
+    let (s, op) = value(Operator::Grad, alt((ws(tag("∇")), ws(tag("&#x2207;")))))(input)?;
+    Ok((s, op))
+}
 pub fn dot(input: Span) -> IResult<Operator> {
     let (s, op) = value(Operator::Dot, alt((ws(tag("⋅")), ws(tag("&#x22c5;")))))(input)?;
     Ok((s, op))
@@ -236,12 +255,20 @@ pub fn cross(input: Span) -> IResult<Operator> {
     Ok((s, op))
 }
 
-pub fn vector(input: Span) -> IResult<Operator> {
-    let (s, op) = value(Operator::Vector, alt((ws(tag("→")), ws(tag("&#x2192;")))))(input)?;
+pub fn down_arrow(input: Span) -> IResult<Operator> {
+    let (s, op) = value(
+        Operator::DownArrow,
+        alt((ws(tag("↓")), ws(tag("&#x2193;")))),
+    )(input)?;
+    Ok((s, op))
+}
+
+pub fn int(input: Span) -> IResult<Operator> {
+    let (s, op) = value(Operator::Int, alt((ws(tag("∫")), ws(tag("&#x222b;")))))(input)?;
     Ok((s, op))
 }
 
-pub fn operator_other(input: Span) -> IResult<Operator> {
+fn operator_other(input: Span) -> IResult<Operator> {
     let (s, consumed) = ws(recognize(not_line_ending))(input)?;
     let op = Operator::Other(consumed.to_string());
     Ok((s, op))
@@ -255,11 +282,15 @@ pub fn operator(input: Span) -> IResult<Operator> {
         lparen,
         rparen,
         mean,
+        hat,
         multiply,
         divide,
+        grad,
         dot,
         cross,
-        vector,
+        period,
+        down_arrow,
+        int,
         operator_other,
     ))(input)?;
     Ok((s, op))