I need to parse the following HTML document:

```
<span class="revision-gradient shadowed">90</span>
<span class="revision-gradient not_shadowed">75</span>
<span class="revision-gradient shadowed">85</span>
<span class="revision-gradient blurred">60</span>

```

To return a list:

```
[90, 75, 85, 60]

```

I would typically use this code, but I'm not sure how to parse for partial matches:

```
document <- htmlParse(url)
myList <- unlist(lapply(document['//span[@class="revision-gradient"]'],xmlValue))

```