I have a file that needs to take the contents within tags. For example: 

```
<Model500>
ABC
BCD 
CDE
</Model500>

<Model500>
123
234
345
</Model500>

```

I would like to extract the contents within 

```
<Model500>
</Model500>

```

using 'sed'

So it would look like

```
ABC
BCD
CDE

123
234
345

```

I have attempted this using 

```
sed -e 's/<Model>\,/</Model>/p' file.txt

```

But the special characters are causing issues. Any advice? Thank you.